feat: postMessage API #553

Job	Run time
Build & static code analysis	1m 40s
Check changeset	1m 29s
Android road test (RNApp & AndroidApp - Vanilla)	25m 16s
iOS road test (TesterIntegrated)	30m 37s
iOS road test (RNApp & AppleApp - Vanilla)	38m 1s
iOS road test (RNApp & AppleApp - Expo)	25m 59s
Android road test (RNApp & AndroidApp - Expo)	39m 54s
Android road test (TesterIntegrated)	15m 51s
	2h 58m 47s

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