[IMP] mail, *: don't track fields at create

*: project, crm, maintenance, helpdesk,

It is useless to track fields during create since they
have no initial value and future tracking message will
show changes on tracked field.

We can log a default creation message instead
(as it is now if there is no mail_create_nolog context key)

This change will implies
- less queries when creating record
- cleaner creation messages
- less occurence of mail_create_nolog ctx key

Removing tracking at create could break the creation subtypes
mechanism (example: following task creation subtype on project)
Instead of using _track_subtype to give a subtype at create,
a new _creation_subtype method can be override. If a creation
subtype is set on a specific modlel, creation messages will be
create by message_post instead of _message_log.

We also need to adapt the message_track_post_template in order to
keep this feature whithout tracking.

Task: #1916916

closes odoo/odoo#31945

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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