[WIP] Add tests for different storage platforms with actual mocks (SQLite, idb-keyval)

[chrispader]

@tgolen (no need to add comments yet)

Details

Based on the ideas and notes in #526

Related Issues

GH_LINK

Automated Tests

Manual Tests

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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

MacOS: Desktop