Add comprehensive tests for Parks API and models

- Implemented extensive test cases for the Parks API, covering endpoints for listing, retrieving, creating, updating, and deleting parks.
- Added tests for filtering, searching, and ordering parks in the API.
- Created tests for error handling in the API, including malformed JSON and unsupported methods.
- Developed model tests for Park, ParkArea, Company, and ParkReview models, ensuring validation and constraints are enforced.
- Introduced utility mixins for API and model testing to streamline assertions and enhance test readability.
- Included integration tests to validate complete workflows involving park creation, retrieval, updating, and deletion.

email_service/services.py

@@ -9,7 +9,7 @@ import base64
 
 class EmailService:
     @staticmethod
-    def send_email(to, subject, text, from_email=None, html=None, reply_to=None, request=None, site=None):
+    def send_email(*, to: str, subject: str, text: str, from_email: str = None, html: str = None, reply_to: str = None, request = None, site = None):
         # Get the site configuration
         if site is None and request is not None:
             site = get_current_site(request)