[16.0][IMP] web_chatter_position: implement feature on controller and add switch button

[trisdoan]

Context

• The Switch Button was dropped during migration to 16.0, which I assumed it was due to the approach taken at that time.
  • In Odoo 15, the position was patched in Controller and Renderer and adjusted by DOM
  • In Odoo 16, it was chosen to do it via Compiler, which the component (Form) needs to be destroyed to re-trigger the Compiler.
  • There was a comment about it but probably missed.

This changes

• Revert to the approach implemented on Odoo 15.0: by taking advantage of OWL cycles
• Re-introduce the switch button

Result

1. No Attachment present

web_chatter_result.webm

2. Attachment present
   web_chatter_result-(2).webm

[trisdoan]

Hello @ivantodorovich, would you mind taking a look at this

[trisdoan]

DRAFT: event listeners are lost when chatter is at the bottom

[fanha99]

nice