Managing bindings in bindable RecyclerView adapter and view holders

[pavel-leonenko]

Description

Added possibility to

• manually attach and detach bindings of all existing ViewHolders managed by a BindableRecyclerViewAdapter;
• manually dispose all subscriptions inside BindableRecyclerViewAdapter when they are no longer needed (typically in Fragment.OnDestroyView.

API Changes

Added:

interface IBindableRecyclerViewAdapter:
 - void DoAttachBindings()
 - void DoDetachBindings()
 - void CleanUp()

Platforms Affected

• Android

Behavioral/Visual Changes

None

Before/After Screenshots

Not applicable

PR Checklist

• I have read the CONTRIBUTING document
• My code follows the code styles
• Targets the correct branch
• Tests are passing (or failures are unrelated)