[REF] rating, project: sending request is now a classic message post

This allows to better control the posting process, notably using custom
layout to encapsulate emails. Previously to this commit a simple email was
send using a template. Now this template is used to post a message on the
record asking for customer request.

New parameters are added on the request send method

 * a subtype, allowing some custom behavior with followers; by default the
   behavior is to log a note with the customer being in the recipients list;
 * composition_mode can be given and propagated to message_post_with_template
   allowing a comment or mass mailing mode;

This commit is related to task 51122 (and PR #24052).

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