feat: [MR-354] Load & validate protos asynchronously #24507

Job	Run time
Bazel Test All	10m 1s
Bazel Build All Config Check	0s
Bazel Build Fuzzers	4m 13s
Bazel Test macOS Intel	0s
Bazel Build Fuzzers AFL	2m 33s
Build IC	13m 51s
Cargo Build Release Linux	9m 37s
Cargo Clippy Linux	5m 31s
Python CI Tests	1m 50s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	30s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	28s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	31s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	31s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	26s
	50m 2s

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