mobile: v2 implementation #1394

Job	Run time
frontend tests on ubuntu-latest	2m 12s
frontend tests on windows-latest	5m 33s
check commits	33s
backend build on ubuntu-latest	2m 31s
frontend tests on macOS-latest	3m 51s
backend build on windows-latest	5m 29s
RPC proto compilation check	3m 34s
backend build on macOS-latest	5m 51s
integration test	5m 51s
lint	2m 55s
unit tests	26s
unit-race	34s
	39m 20s

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