[RNMobile] Master thread: Native support for inner blocks

[Tug]

In previous efforts we tried to port the BlockManager and related components from the Gutenberg mobile repository to the Gutenberg repository, to pave the way for inner blocks on RN mobile. However that prove to be unsuccessful as the PR was getting too big to review at once.

To give more context, BlockManager is the equivalent of BlockList and it depends on many components that still lives in the gutenberg-mobile repo.
The goal here will be to make that port so that we can ultimately have BlockList be reused from the gutenberg repository in components such as InnerBlock.

This issue will serve as a reference for this task and will help monitor the progress on the different PRs.

• 1. Move BottomSheet and Picker to @wordpress/components make them available from outside the block-editor package (GB PR#15750 and GB-Mobile PR#1008)
• 2. Port KeyboardAvoidingView, KeyboardAwareFlatList and ReadableContentView to gutenberg so we can reuse those from there
• 3. Inserter ported from BlockPicker
• 4. BlockInspector ported from InlineToolbar
• 5. BlockToolbar ported from BlockToolbar
• 6. BlockListBlock ported from BlockHolder
• 7. BlockList ported from BlockManager
• 8. Create a native version of InnerBlock

cc @koke @hypest @daniloercoli @gziolo

[hypest]

I personally like the approach portrayed in this new ticket better, which is to port the deeper/smaller/more-leafy components first and then move up the dependency tree. I've been advocating for that in the past, though I understand it's not easy to validate unless one tries the "big" approach first. I'm optimistic about this new approach! 👐

[koke]

Is this replacing wordpress-mobile/gutenberg-mobile#958 then? I don't mind if you prefer tracking progress here, but please make sure the project has the right issue in the right place.

[Tug]

Sorry @koke I forgot about the issue you created and made another one here. I agree we can close this one then 👍