mobile: v2 implementation #1399

Job	Run time
backend build on ubuntu-latest	2m 31s
frontend tests on ubuntu-latest	2m 13s
backend build on windows-latest	14m 49s
RPC proto compilation check	3m 22s
frontend tests on windows-latest	7m 56s
backend build on macOS-latest	7m 20s
check commits	31s
frontend tests on macOS-latest	3m 35s
unit-race	30s
integration test	7m 42s
lint	3m 6s
unit tests	28s
	54m 3s

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