mobile: v2 implementation #1390

Job	Run time
integration test	2m 45s
backend build on ubuntu-latest	4m 1s
frontend tests on ubuntu-latest	2m 17s
check commits	31s
backend build on windows-latest	14m 28s
frontend tests on windows-latest	12m 53s
lint	3m 38s
backend build on macOS-latest	7m 55s
frontend tests on macOS-latest	6m 21s
RPC proto compilation check	4m 18s
unit tests	39s
unit-race	2m 44s
	1h 2m 30s

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