Tests

feat: `MsgToL1` hash computation #966

Job	Run time
no-std build	2m 45s
Unix tests (ubuntu-latest, stable)	4m 37s
WASM tests	3m 58s
Unix tests (ubuntu-latest, nightly)	3m 12s
Windows tests (stable, x86_64-pc-windows-gnu)	8m 29s
Unix tests (macos-11, stable)	3m 51s
Windows tests (stable, x86_64-pc-windows-msvc)	7m 11s
Windows tests (nightly, x86_64-pc-windows-gnu)	4m 20s
Unix tests (macos-11, nightly)	5m 14s
Windows tests (nightly, x86_64-pc-windows-msvc)	5m 46s
	49m 23s

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