[FIX] mail: warn user on record reload before post message

Before this commit, the user could lost some unsaved changes in a record when
posting a message in the chatter.

This is due to reloading the data on the record, which is necessary because
a `message_post` may make some changes on the record [1].

With this commit, a dialog will warn the user that the record will be reloaded
in the following cases:

    a) posting a message in the basic composer that will reload the record
    b) opening the full-composer when the record is dirty

Indeed, any operation after opening the full-composer will always refresh the
record (even closing the dialog).

Known issues:

    - a record is not considered as dirty if we only make changes in its
      description from a pad.

      > the content of the pad will be erased without any warning...

[1] https://github.com/odoo-dev/odoo/commit/803d5cf04835fcf8e7ddb143e1ab140408beef93

opw-1825005

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