feat: integrate Firebase for Web and Crashlytics for iOS #2135

Job	Run time
Build (Unit-tests & Android-Lint)	58m 38s
Android UI-tests on emulator (35, default)	15m 18s
Android UI-tests on emulator (36, default)	16m 24s
Android UI-tests on emulator (34, default)	16m 6s
Android UI-tests on emulator (26, default)	15m 13s
Android UI-tests on emulator (37, default)	21s
Android UI-tests on emulator (25, default)	15m 28s
Android UI-tests on emulator (33, default)	15m 34s
Android UI-tests on emulator (27, default)	15m 12s
Android UI-tests on emulator (28, default)	16m 34s
Android UI-tests on emulator (23, default)	16m 30s
Android UI-tests on emulator (30, default)	17m 1s
Android UI-tests on emulator (31, default)	14m 56s
Android UI-tests on emulator (29, default)	16m 55s
Android UI-tests on emulator (32, default)	17m 52s
Android UI-tests on emulator (24, default)	14m 30s
	4h 42m 32s

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