[IMP] base_external_system: Add create bypass

* In cases of deep inheritance, it may be required to create an adapter directly. Add an override in the create via the env context to support this.
* Add default system type if creating from an interface
* Fix interface assignment during creation in adapter

base_external_system/models/external_system_adapter.py

@@ -69,3 +69,13 @@ class ExternalSystemAdapter(models.AbstractModel):
             odoo.exceptions.UserError: In the event of a good connection.
         """
         raise UserError(_('The connection was a success.'))
+
+    @api.model
+    def create(self, vals):
+        context_self = self.with_context(no_create_interface=True)
+        vals.update({
+            'system_type': self._name,
+        })
+        record = super(ExternalSystemAdapter, context_self).create(vals)
+        record.system_id.interface = record
+        return record