[REF] mail: reorganize a bit 13+ thread code and set some methods private

PURPOSE

Since v13 some commits added code in mail thread file. This file is already
quite long and keeping it organized allow to understand its content.

SPECIFICATIONS

Clearly separate CRUD / CRUD HELPERS / TRACKING / ... . Notably tracking
code was split accross two code sections.

Make some internal tools methods private. They do not require to be public
  * with_lang: does not makes sense to be available outside of odoo. It is
    renamed to _fallback_lang as it does not allow to set a specific lang in
    the environment like with_user. It is used to fallback on user's lang
    in context;
  * get_mail_message_access: purely internal method used for access rights;

LINKS

Task ID-2327096 (code cleaning)
PR #56631

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