E2E Tests: add visual regression testing

[mnzaki]

Description

Jest has support for image snapshots: https://www.npmjs.com/package/jest-image-snapshot
Detox has support for taking screenshots: https://github.com/wix/Detox/blob/master/docs/APIRef.DeviceObjectAPI.md#devicetakescreenshotname

BUT detox will only save artifacts (including screenshots) after test completion, which is not compatible with how jest-image-snapshot expects to test them

Another issue is that the tests run on both android and iOS and will have different screenshots, and that must be compensated for somehow