* Refactor Bedrock response stream shape handling
- Introduced a module-level constant `BEDROCK_RESPONSE_STREAM_SHAPE` to cache the response stream shape, eliminating the need for per-instance caching in `BedrockEventStreamDecoderBase`.
- Updated relevant methods to utilize the new constant, improving performance by avoiding redundant loading of the shape.
- Added tests to ensure the shape is loaded correctly at import time and is consistent across different modules.
- Added a new mock server script for testing Bedrock pass-through functionality.
* Refactor response parsing for Bedrock and SageMaker
- Improved code readability by formatting the parsing method calls in `AWSEventStreamDecoder` for both Bedrock and SageMaker response stream shapes.
- Added blank lines for better separation of code blocks in `invoke_handler.py` and `common_utils.py` to enhance maintainability.
* Enhance error handling for Bedrock and SageMaker response stream shape loading
- Wrapped the loading logic in `_load_bedrock_response_stream_shape` and `_load_sagemaker_response_stream_shape` with try-except blocks to gracefully handle exceptions.
- Added logging to warn when the response stream shape cannot be pre-loaded, ensuring the module imports cleanly.
- Updated tests to verify that loading failures return `None` instead of propagating exceptions.
* Implement error handling for missing response stream shapes in Bedrock and SageMaker
- Added checks in `_parse_message_from_event` methods to raise appropriate errors when `BEDROCK_RESPONSE_STREAM_SHAPE` or `SAGEMAKER_RESPONSE_STREAM_SHAPE` is None, ensuring clearer error reporting.
- Updated logging messages to reflect the unavailability of event-stream decoding for both Bedrock and SageMaker.
- Enhanced unit tests to verify that the correct exceptions are raised when the response stream shapes are not loaded.
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