bench: add tokio spawn_blocking + std fs benchmark

[MrCroxx]

Hi. Thank you for providing the crate compio. 🥰

This PR introduces tokio spawn_blocking + std case for fs benchmark.

The benchmark shows that compio works really good on reads. However, the write part is slower than tokio spawn_blocking + std. I'm not sure if I've done it correctly. Could you please help? 🙏

Raw output:

read-random/std         time:   [32.088 µs 32.115 µs 32.144 µs]
                        change: [-0.3149% -0.1749% -0.0343%] (p = 0.02 < 0.05)
                        Change within noise threshold.
Found 3 outliers among 100 measurements (3.00%)
  2 (2.00%) high mild
  1 (1.00%) high severe
read-random/tokio       time:   [1.0739 ms 1.1160 ms 1.1572 ms]
                        change: [-7.0959% -3.4174% +0.6847%] (p = 0.10 > 0.05)
                        No change in performance detected.
read-random/tokio_std   time:   [645.81 µs 675.20 µs 703.76 µs]
                        change: [-19.822% -16.300% -12.883%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
  5 (5.00%) low mild
read-random/compio      time:   [55.984 µs 56.038 µs 56.099 µs]
                        change: [+1.2718% +1.4833% +1.7111%] (p = 0.00 < 0.05)
                        Performance has regressed.
Found 15 outliers among 100 measurements (15.00%)
  5 (5.00%) low severe
  3 (3.00%) low mild
  3 (3.00%) high mild
  4 (4.00%) high severe
read-random/compio-join time:   [37.399 µs 37.426 µs 37.456 µs]
                        change: [-7.4126% -6.6096% -5.7807%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 3 outliers among 100 measurements (3.00%)
  1 (1.00%) high mild
  2 (2.00%) high severe
read-random/monoio      time:   [52.061 µs 52.112 µs 52.168 µs]
                        change: [-0.1142% -0.0114% +0.0913%] (p = 0.83 > 0.05)
                        No change in performance detected.
Found 11 outliers among 100 measurements (11.00%)
  1 (1.00%) low mild
  8 (8.00%) high mild
  2 (2.00%) high severe

read-all/std            time:   [1.2974 µs 1.3010 µs 1.3047 µs]
                        thrpt:  [2993.9 GiB/s 3002.5 GiB/s 3010.8 GiB/s]
                 change:
                        time:   [-1.4735% -1.2075% -0.9169%] (p = 0.00 < 0.05)
                        thrpt:  [+0.9254% +1.2222% +1.4955%]
                        Change within noise threshold.
Found 3 outliers among 100 measurements (3.00%)
  1 (1.00%) high mild
  2 (2.00%) high severe
read-all/tokio          time:   [17.116 µs 17.746 µs 18.336 µs]
                        thrpt:  [213.04 GiB/s 220.12 GiB/s 228.22 GiB/s]
                 change:
                        time:   [-2.7325% +1.0449% +4.9322%] (p = 0.58 > 0.05)
                        thrpt:  [-4.7003% -1.0341% +2.8093%]
                        No change in performance detected.
Found 8 outliers among 100 measurements (8.00%)
  8 (8.00%) low mild
read-all/tokio_std      time:   [14.740 µs 15.265 µs 15.755 µs]
                        thrpt:  [247.94 GiB/s 255.90 GiB/s 265.01 GiB/s]
Found 13 outliers among 100 measurements (13.00%)
  13 (13.00%) low mild
read-all/compio         time:   [864.57 ns 865.31 ns 866.07 ns]
                        thrpt:  [4510.3 GiB/s 4514.3 GiB/s 4518.1 GiB/s]
                 change:
                        time:   [+3.0212% +3.3689% +3.7015%] (p = 0.00 < 0.05)
                        thrpt:  [-3.5694% -3.2591% -2.9326%]
                        Performance has regressed.
Found 7 outliers among 100 measurements (7.00%)
  1 (1.00%) low mild
  4 (4.00%) high mild
  2 (2.00%) high severe
read-all/monoio         time:   [797.30 ns 798.28 ns 799.35 ns]
                        thrpt:  [4886.8 GiB/s 4893.3 GiB/s 4899.3 GiB/s]
                 change:
                        time:   [+0.1896% +0.3742% +0.5816%] (p = 0.00 < 0.05)
                        thrpt:  [-0.5783% -0.3728% -0.1893%]
                        Change within noise threshold.
Found 6 outliers among 100 measurements (6.00%)
  6 (6.00%) high mild

write-random/std        time:   [43.241 µs 43.292 µs 43.351 µs]
                        change: [+1.8799% +2.1045% +2.3321%] (p = 0.00 < 0.05)
                        Performance has regressed.
Found 3 outliers among 100 measurements (3.00%)
  3 (3.00%) high mild
write-random/tokio      time:   [1.0925 ms 1.1352 ms 1.1770 ms]
                        change: [-2.9237% +0.7864% +4.3320%] (p = 0.68 > 0.05)
                        No change in performance detected.
write-random/tokio_std  time:   [66.256 µs 72.390 µs 78.288 µs]
Found 7 outliers among 100 measurements (7.00%)
  7 (7.00%) high mild
write-random/compio     time:   [433.36 µs 453.40 µs 473.76 µs]
                        change: [+2.2686% +7.0361% +12.247%] (p = 0.01 < 0.05)
                        Performance has regressed.
write-random/compio-join
                        time:   [126.05 µs 127.59 µs 128.94 µs]
                        change: [+3.8459% +5.4051% +6.8271%] (p = 0.00 < 0.05)
                        Performance has regressed.
write-random/monoio     time:   [429.43 µs 447.35 µs 465.80 µs]
                        change: [+7.3082% +12.674% +18.043%] (p = 0.00 < 0.05)
                        Performance has regressed.
write-random/monoio-join
                        time:   [97.917 µs 104.98 µs 112.43 µs]
                        change: [-9.4316% -5.7760% -2.5335%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 12 outliers among 100 measurements (12.00%)
  12 (12.00%) low severe

write-all/std           time:   [11.692 µs 11.704 µs 11.719 µs]
                        thrpt:  [5.2083 GiB/s 5.2147 GiB/s 5.2202 GiB/s]
                 change:
                        time:   [+0.0185% +0.3369% +0.8174%] (p = 0.15 > 0.05)
                        thrpt:  [-0.8108% -0.3358% -0.0185%]
                        No change in performance detected.
Found 13 outliers among 100 measurements (13.00%)
  7 (7.00%) high mild
  6 (6.00%) high severe
write-all/tokio         time:   [157.17 µs 164.08 µs 170.56 µs]
                        thrpt:  [366.44 MiB/s 380.92 MiB/s 397.65 MiB/s]
                 change:
                        time:   [-4.8568% -0.7049% +3.3899%] (p = 0.74 > 0.05)
                        thrpt:  [-3.2788% +0.7099% +5.1047%]
                        No change in performance detected.
write-all/tokio_std     time:   [23.723 µs 25.241 µs 26.837 µs]
                        thrpt:  [2.2743 GiB/s 2.4181 GiB/s 2.5728 GiB/s]
write-all/compio        time:   [105.73 µs 110.97 µs 116.38 µs]
                        thrpt:  [537.05 MiB/s 563.21 MiB/s 591.14 MiB/s]
                 change:
                        time:   [-2.9022% +2.3375% +7.9584%] (p = 0.38 > 0.05)
                        thrpt:  [-7.3717% -2.2841% +2.9890%]
                        No change in performance detected.
write-all/monoio        time:   [101.60 µs 105.76 µs 110.00 µs]
                        thrpt:  [568.21 MiB/s 590.99 MiB/s 615.18 MiB/s]
                 change:
                        time:   [-16.455% -12.631% -8.4236%] (p = 0.00 < 0.05)
                        thrpt:  [+9.1984% +14.458% +19.695%]
                        Performance has improved.