Tests

feat: `MsgToL1` hash computation #975

Job	Run time
no-std build	3m 1s
Unix tests (ubuntu-latest, stable)	3m 35s
Unix tests (ubuntu-latest, nightly)	3m 14s
Unix tests (macos-11, stable)	4m 4s
WASM tests	8m 40s
Unix tests (macos-11, nightly)	4m 48s
Windows tests (stable, x86_64-pc-windows-gnu)	9m 25s
Windows tests (stable, x86_64-pc-windows-msvc)	6m 30s
Windows tests (nightly, x86_64-pc-windows-gnu)	13m 54s
Windows tests (nightly, x86_64-pc-windows-msvc)	7m 43s
	1h 4m 54s

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