Purpose of this commit is to provide users templates to use when sending
SMS. It is inspired from what already exists for mail templates. This commit
* adds templates for SMS
* users can now create template for SMS Text messages similar to mail
templates;
* jinja syntax is supported for body like mail templates, which is why
templates are linked to a given model;
* refactor the SMS composer
* templates are supported in composer like the message composer. This is
supported only in mass mode to avoid bloating the interface in standard
composition mode;
* composer code is rewritten to support various use cases (comment, mass
sms, numbers, ...) and better fits all use cases;
* composer is extended to support notably mass SMS without posting messages;
Templates will also be used in a near future in mass sms sending (mass
mailing application improvement) and in marketing automation (for enterprise).
Tests are updated and added to ensure feature works.
Related to task 1922163
Linked to PR #33510
Co-Authored-By: Thibault Delavallee <tde@odoo.com>
Co-Authored-By: Pierre Rousseau <pro@odoo.com>
