Tests

feat: `MsgToL1` hash computation (#476) #978

Job	Run time
no-std build	2m 20s
Windows tests (stable, x86_64-pc-windows-gnu)	8m 31s
Windows tests (stable, x86_64-pc-windows-msvc)	5m 10s
Windows tests (nightly, x86_64-pc-windows-gnu)	4m 12s
Unix tests (ubuntu-latest, stable)	2m 0s
Windows tests (nightly, x86_64-pc-windows-msvc)	6m 44s
Unix tests (ubuntu-latest, nightly)	3m 38s
Unix tests (macos-11, stable)	3m 46s
WASM tests	6m 29s
Unix tests (macos-11, nightly)	4m 59s
	47m 49s

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