[RFC] acount_payment_mode dependency removal

[rousseldenis]

In order to simplify (again) the payment flow, it has been noted that we would remove the dependency on account_payment_mode module.

This could be done :

• Using directly the acquirer as pivot. We checked that this is multi-company compliant as there is a company_id field.
• So, on shopinvader.payment model, we remove the payment_mode_id and replace by acquirer_id. That's a more direct access to it.
• The method that return payment method id when getting cart will return the acquirer_id to be passed to each specific implementation services isntead of payment method id (we would let the dict keys to stay compatible).

The improvements would includes also the removal of sale_automatic_workflow_payment_mode needs as we'll use the odoo payment module methods to generate payments for reconciliation processes.

@sebastienbeau @sbidoul @lmignon

[rousseldenis]

As we depends on standard acquirer, we also need to change the sale_automatic_workflow_payment_mode to sale_automatic_workflow_payment.

It will implement workflow assignation to sale order depending on transactions created. As the workflow is defined on acquirer, it will be passed to the sale order.

[github-actions[bot]]

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