chore: add `IntoTxEnv` bound (#20) #86

Job	Run time
docs	45s
check no_std	14s
doctest	27s
feature-checks	24s
feature-propagation	53s
fmt	12s
clippy	20s
wasm-unknown	19s
wasm-wasi	19s
test ubuntu-latest stable --no-default-features	23s
test ubuntu-latest stable	36s
test ubuntu-latest stable --all-features	31s
test ubuntu-latest nightly --no-default-features	49s
test ubuntu-latest nightly	53s
test ubuntu-latest nightly --all-features	48s
test ubuntu-latest 1.81 --no-default-features	22s
test ubuntu-latest 1.81	26s
test windows-latest stable --no-default-features	2m 1s
test windows-latest stable	1m 58s
test windows-latest stable --all-features	1m 17s
test windows-latest nightly --no-default-features	1m 50s
test windows-latest nightly	1m 58s
test windows-latest nightly --all-features	1m 47s
test windows-latest 1.81 --no-default-features	50s
test windows-latest 1.81	1m 8s
deny / cargo deny check	23s
ci success	2s
	21m 55s

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