Tests

feat: `MsgToL1` hash computation #897

Job	Run time
no-std build	3m 20s
Windows tests (stable, x86_64-pc-windows-gnu)	19m 34s
Windows tests (stable, x86_64-pc-windows-msvc)	18m 40s
WASM tests	6m 59s
Unix tests (ubuntu-latest, stable)	15m 9s
Windows tests (nightly, x86_64-pc-windows-gnu)	15m 21s
Unix tests (ubuntu-latest, nightly)	15m 12s
Windows tests (nightly, x86_64-pc-windows-msvc)	18m 35s
Unix tests (macos-11, stable)	15m 11s
Unix tests (macos-11, nightly)	15m 12s
	2h 23m 13s

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