Changing the name of model payment.acquirer to payment.provider
and everything that it touches. It is technically incorrect to
use the term "acquirer" for systems that only provide a service
of payment.
After this commit the model payment.acquirer and everything
related to it will be renamed to payment.provider.
Task - 2842088
closesodoo/documentation#1981
Related: odoo/upgrade#3542
Related: odoo/odoo#90899
Related: odoo/enterprise#27131
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>