[IMP] mail: open document threads in thread windows

Also roughly called "open chatter in chat windows".

With this commit, document threads can now be detached in a small thread window.
It uses client-side cross-tab window synchronization by means of the local storage.

To detach a document thread in a thread window, click on the document thread preview
in the systray messaging menu when receving a new (needaction) document thread message.

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  Technical Limitations
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  1. In order to use this feature, the user must select the Notification Management
     'Handle with Odoo' in the Preferences of the User settings (top-right menu).

  2. For the moment, only needaction messages automatically updates the thread window. Manual
     refresh is still needed for other kinds of messages (e.g. reload document record to fetch
     new messages in the document thread).

Server-side code changes are required to receive new document thread message notifications on the
longpoll bus, which would fix the limitations above.

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  Future Works
-------------------------

  1. Receive any new message from the document thread window when it is detached.
  2. Log a note from the document thread window.

Task-33118

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