refactor(connector): update add connector script with new connector features (#8213)
Files to modify:


**mod.rs**
  Remove:
    - function: private::get_url
    - function: private::get_url
    - impl: impl ConnectorSpecifications for project
  Add:
    - function: private::validate_mandate_payment
    - function: private::validate_psync_reference_id
    - function: private::get_url
    - function: private::get_url
    - function: private::get_connector_about
    - function: private::get_supported_payment_methods
    - function: private::get_supported_webhook_flows
    - impl: impl ConnectorSpecifications for project

**test.rs**
  Modify existing code

**transformers.rs**
  Modify existing code

**default_implementations.rs**
  Modify existing code