RATIONALE
Simplify field management for mail / phone / sms flows. Make it working out
of the box, easier to use and tweak.
SPECIFICATIONS
Simplify model custom code when dealing with phone and sms by using helpers
and standard behavior defined on all models.
'_sms_get_partner_fields' was introduced at odoo/odoo@bdebcab0ce to have a generic
implementation of finding partners on a record. Since then another version
has been added directly in 'mail' module, using '_mail_get_partners'.
'_sms_get_number_fields' was introduced at the same time to have a generic
implementation of finding numbers on a record. Since then a generic and
improved version has been added directly in 'phone_validation' module, see
'_phone_get_number_fields'.
Those method can therefore be removed, and replaced by the generic ones
available on BaseModel.
Task-3422449 (Mail, Phone: Move and improve field helpers)
Prepares Task-36879 (Mail: Support MultiCompany Aliases)
Part-of: odoo/odoo#130468