Refactor type casting in Cython files for improved clarity and consistency

- Updated various Cython files to explicitly cast types, enhancing type safety and readability.
- Adjusted the `engine_name` property in `InferenceEngine` and its subclasses to be set directly in the constructor.
- Modified the `request` method in `_SessionWithBase` to accept `*args` for better flexibility.
- Ensured proper type casting for return values in methods across multiple classes, including `Inference`, `CoreMLEngine`, and `TensorRTEngine`.

These changes aim to streamline the codebase and improve maintainability by enforcing consistent type usage.

e2e/conftest.py

@@ -35,14 +35,14 @@ class _SessionWithBase(requests.Session):
         self._base = base.rstrip("/")
         self._default_timeout = default_timeout
 
-    def request(self, method, url, **kwargs):
+    def request(self, method, url, *args, **kwargs):
         if url.startswith("http://") or url.startswith("https://"):
             full = url
         else:
             path = url if url.startswith("/") else f"/{url}"
             full = f"{self._base}{path}"
         kwargs.setdefault("timeout", self._default_timeout)
-        return super().request(method, full, **kwargs)
+        return super().request(method, full, *args, **kwargs)
 
 
 @pytest.fixture(scope="session")