Add type hints to middleware modules (Flask, Django, WSGI) #137
Description
Summary
Add comprehensive type annotations to the middleware modules to complete the type hints coverage started in #136.
Scope
python3/raygun4py/middleware/flask.pypython3/raygun4py/middleware/django.pypython3/raygun4py/middleware/wsgi.py
Acceptance Criteria
- All public methods and classes have type annotations
- mypy passes with no errors on middleware modules
- Existing tests continue to pass