[IMP] mail: allow message creation in batch

PURPOSE

Allow quick message creation by allowing create multi on mail.message.
Also introduce a new helper tool method to log in batch on records.

SPECIFICATIONS

Purpose of this commit is to add a way to log notes in batch on a document.
Those notes are logged without any notification mechanism, allowing to
attach a note in as few queries as possible.

This is implemented by

  * allowing create multi on mail.message. Nothing changes in its behavior
    except that it is not working on a list of dictionaries;
  * adding a ``_message_log_batch`` tool method allowing to post a batch
    of notes on records;
  * adding a tool method to correctly find author / email_from, to be used
    in various message_post / log / notify methods in order to have the
    same behavior in all those methods;

Logging in batch will soon be used in SMS when attaching a note to sent
SMS without having extra notifications. This will be used notably when
performing mass SMS without using the standard notification mechanism.

LINKS

Task 1997464
PR #34424
Original SMS addition: Task 1922163 (4287481)

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