[IMP] iap, various: implement _neutralize method

An overridable model method was added in a previous commit in order to
neutralize a database.

This commit adds the implementation of this method on the `iap.account` model.
A _get_iap_config_paremeters method is also added on this model.
Each iap service must override this method to extend the list of
`ir.config_parameter` that need to be neutralized.

Part-of: odoo/odoo#67825