feat: enable custom_reg_form capability (#256)

The capability could be used enabled using the `REGISTRATION_EXTENSION_FORM` setting.

This is a feature of upstream openedx, the platform has that capability of registration
extension models and maybe for people like opencraft would like.

refs: #253

eox_core/edxapp_wrapper/backends/users_m_v1.py

@@ -39,6 +39,7 @@
  REGISTER_USER as post_register # pylint: disable=import-error
 from openedx.core.djangoapps.user_authn.views.registration_form import ( # pylint: disable=import-error
  AccountCreationForm,
+ get_registration_extension_form,
 )
 from openedx.core.djangolib.oauth2_retirement_utils import \
  retire_dot_oauth2_models # pylint: disable=import-error,unused-import
@@ -174,12 +175,12 @@ def create_edxapp_user(*args, **kwargs):
 
  # Go ahead and create the new user
  with transaction.atomic():
- # In theory is possible to extend the registration form with a custom app
+ # Is possible to extend the registration form with a custom app
  # An example form app for this can be found at http://github.com/open-craft/custom-form-app
- # form = get_registration_extension_form(data=params)
+ custom_form = get_registration_extension_form(data=account_creation_form_data["data"])
  # if not form:
  form = EdnxAccountCreationForm(**account_creation_form_data)
- (user, profile, registration) = do_create_account(form) # pylint: disable=unused-variable
+ (user, profile, registration) = do_create_account(form, custom_form) # pylint: disable=unused-variable
 
  site = kwargs.pop("site", False)
  if site: