* docs: clarify RPC error handling and update related documentation
- Added explanations regarding the behavior of the framework when a service is not implemented, specifically that it returns AIMRT_RPC_STATUS_OK instead of the expected error code due to limitations in ROS2.
- Enhanced the description of the `Status` class to clarify that its error messages are primarily for framework-level issues, guiding developers on how to handle business-level errors.
- Updated the documentation to improve understanding of RPC call behavior in AimRT.
* docs: enhance RPC error code documentation in Status class
- Expanded the documentation for the `Status` class to include a detailed table of error codes, their values, and descriptions for both server and client errors.
- Clarified that the error codes primarily indicate framework-level issues, guiding developers on how to handle business-level errors effectively.
- Improved overall clarity and accessibility of the RPC error handling documentation.
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