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.

engines/__init__.py

@@ -40,7 +40,7 @@ tensor_gpu_index = _check_tensor_gpu_index()
 
 def _select_engine_class():
     if tensor_gpu_index > -1:
-        from engines.tensorrt_engine import TensorRTEngine
+        from engines.tensorrt_engine import TensorRTEngine  # pyright: ignore[reportMissingImports]
         return TensorRTEngine
     if _is_apple_silicon():
         from engines.coreml_engine import CoreMLEngine