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.

ai_availability_status.pyx

@@ -25,7 +25,7 @@ cdef class AIAvailabilityStatus:
 
     cdef bytes serialize(self):
         with self._lock:
-            return msgpack.packb({
+            return <bytes>msgpack.packb({
                 "s": self.status,
                 "m": self.error_message
             })