mobile: v2 implementation #1391

Job	Run time
backend build on ubuntu-latest	2m 32s
check commits	31s
integration test	2m 35s
backend build on windows-latest	14m 55s
backend build on macOS-latest	7m 34s
lint	2m 56s
frontend tests on ubuntu-latest	2m 7s
RPC proto compilation check	3m 28s
frontend tests on windows-latest	5m 39s
unit tests	32s
frontend tests on macOS-latest	4m 2s
unit-race	29s
	47m 20s

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