[Epic] Detox 20 Breaking Changes

[d4vidi]

Description

This is a meta-PR to put miles with all the planned major and breaking changes and roll them out when ready.

Implemented:

• [x] https://github.com/wix/Detox/issues/2469
• [x] https://github.com/wix/Detox/pull/3289
  • [x] check specs docs, because the feature looks historically underdocumented... 🤔
• [x] https://github.com/wix/Detox/pull/3286
• [x] #3539
• [x] JS: set required Node.js version to be >=12.10.0 82c0e7a45ba829f81d3c4379e7c174cc64428be5
• [x] https://github.com/wix/Detox/pull/3304
• [x] https://github.com/wix/Detox/pull/3310
• [x] https://github.com/wix/Detox/pull/3326
• [x] https://github.com/wix/Detox/pull/3332
• [x] #3352
• [x] #3349
• [x] #3350
• [x] #3355
• [x] #3351
• [x] #3394

In progress:

• [x] #3397
• [x] #3354

Planned:

• [x] #3573
• [ ] #3572
• [ ] #3583
• [ ] #3584

Postponed

• [ ] #3353
• [ ] Android: Usage of ActivityTestRule instead of ActivityScenarioRule – @d4vidi says that due to the planned multiple apps breaking change, we need to postpone it – otherwise, users will need to fiddle with Android files twice every migration.

[RohovDmytro]

Will Detox v20 will support react-native 0.68.2+?

[d4vidi]

@RohovDmytro https://github.com/wix/Detox/issues/3344