[REF] mail: get rid of thread_model context key

message_post and various mail.thread related code still support a thread_model
context key allowing to redirect message post on another model. Purpose of
this commit is to get rid of that context key and support model / res_id
fields coming from either the record on which we run, either parameters of
message_post. Indeed those parameter match the one used as fields on mail
message. It makes sense to support them for customization if necessary
instead of using a context key.

This context key exists since a lot of time. It is difficult to find the
source as history is quite complex when the mail was refactored in 2012.
See notably 6aa4f80b2d9696a8dcbcc970bbd656b5842b02d4 and 2c4ed841b915cef42fe1f65d27427b7d86d659cd for example.

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