Implemented support for the BACS payment scheme as per the latest technical specifications, enabling the processing of BACS Direct Credits and Direct Debits. Included the mandatory requirement of a Service User Number (SUN) for businesses conducting transactions via BACS. closes odoo/odoo#135696 Task-id: 3326945 X-original-commit: 2e6aeffd7ae9116d3445aa53265919cc29afafc7 Related: odoo/enterprise#47487 Signed-off-by: Quentin De Paoli <qdp@odoo.com> Signed-off-by: Mohamed Erradi (moer) <moer@odoo.com>