introduce code coverage analysis in CI #479

Job	Run time
Cargo Nextest (Linux)	13m 20s
Cargo Nextest (Linux Nightly)	13m 21s
Build neard	4m 55s
Cargo Nextest (MacOS)	15m 21s
Protobuf Backward Compatibility	19s
Sanity Checks	5m 20s
RPC Schema	5m 49s
Style	29s
Backward Compatibility	1m 55s
Upgradability	2m 0s
Genesis Changes	47s
Database Migration	1m 23s
	1h 4m 59s

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