[ADD] mail_autosubscribe_partner_parent: New module mail_autosubscribe_partner_parent

[mpascuall]

This module extends mail_autosubscribe functionality to add the partner parent in copy of their child partner documents.

cc https://github.com/APSL 165068
@miquelalzanillas @lbarry-apsl @javierobcn @peluko00 @BernatObrador @ppyczko please review

[mpascuall]

Hi @pedrobaeza, sorry for pinging you out directly. The tests for the mail_autosubscribe module are failing because in this module we add the parent partner, and the tests do not take this into account. What would be the best way to solve this? Could we create an IMP in mail_autosubscribe with a boolean to mark whether to also add the parent partner in CC? Looking forward to your response, thank you very much!

[pedrobaeza]

What I'm seeing is that mail_composer_cc_bcc has a signature change upstream and there's a mechanism for failing if that happens. Can you rebase to see if this has changed meanwhile?