[FIX] mail, mail_group: recipients of mail groups

Mailing lists (mail.group) should not send specific notification emails.
Indeed there can be a lot of recipients and customizing each email can
take time to compute. This leads to posting a message on a mail.group
being very slow.

It is now possible for a model to customize the notification email
recipients computation. The first use is to ensure that mail.group
encodes recipients using email_to instead of recipients_ids. This way
less processing is performed on notification emails.

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