feat: Implement database backup and restore for wasmJs #1947

Job	Run time
Build (Unit-tests & Android-Lint)	2h 56m 13s
Android UI-tests on emulator (26, default)	11m 39s
Android UI-tests on emulator (27, default)	12m 13s
Android UI-tests on emulator (30, default)	10m 10s
Android UI-tests on emulator (33, default)	9m 32s
Android UI-tests on emulator (24, default)	9m 22s
Android UI-tests on emulator (25, default)	12m 37s
Android UI-tests on emulator (31, default)	10m 29s
Android UI-tests on emulator (28, default)	10m 15s
Android UI-tests on emulator (32, default)	10m 14s
Android UI-tests on emulator (23, default)	12m 34s
Android UI-tests on emulator (34, default)	8m 40s
Android UI-tests on emulator (35, default)	16m 4s
Android UI-tests on emulator (36, default)	11m 12s
Android UI-tests on emulator (29, default)	11m 21s
	5h 32m 35s

Provide feedback