Enhance Prompt Generation Logic and Code Structure for APromptCoder

[YadlaMani]

This update refines the APromptCoder class to improve prompt generation, code maintainability, and context management. Key improvements include:

• Clearer prompt formatting: The new structure prevents unauthorized function invocations by specifying permissions.
• Optimized recall logic: Ensures only relevant information is returned from storage.
• Dynamic context handling: Uses contextWindowRatio to adapt the prompt size based on the model’s context window.
• Improved documentation: Added detailed docstrings and comments for clarity.
• Error handling improvements: Ensures fallback behavior when optimized prompt construction fails.