chore: cleanup

[vansangpfiev]

This pull request includes several changes to improve the readability, maintainability, and functionality of the python_engine module. The most important changes include the introduction of a new StreamWriteCallback function, renaming and refactoring of certain functions and variables, and updates to the handling of process management.

Improvements to readability and maintainability:

• Refactored the WriteCallback function to StreamWriteCallback and moved it inside an anonymous namespace for better encapsulation.
• Renamed variables and functions to follow consistent naming conventions, such as constructWindowsCommandLine to ConstructWindowsCommandLine, cmdLine to cmd_line, and processMap to process_map_. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17]

Process management improvements:

• Added the PythonEngine::GetModelConfig method to retrieve model configurations using a shared lock for thread safety.
• Updated PythonEngine::SpawnProcess to handle process creation for both Windows and POSIX systems, including proper handling of command line arguments and process IDs. [1] [2]
• Improved the PythonEngine::TerminateModelProcess method to correctly handle process termination and resource cleanup. [1] [2]

Additional enhancements:

• Implemented the PythonEngine::HandleChatCompletion method to log a warning message indicating that the feature is not yet supported.
• Added checks and error handling in PythonEngine::HandleInference to ensure the presence of required fields in the JSON body. [1] [2]
• Encapsulated the StreamContext struct and related callback function within the python_engine namespace for better code organization.

These changes collectively enhance the robustness and clarity of the python_engine module, making it easier to maintain and extend in the future.## Describe Your Changes

Fixes Issues

• Closes #
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed