[WIP]feat: add aisuite_llm_python extension with initial implementation

[seymourtang]

This pull request introduces a new extension called aisuite_llm_python and makes several adjustments to the existing configuration files to integrate this new extension. The most important changes include updating the manifest.json and property.json files, adding new Python files for the extension, and removing outdated extensions.

Integration of aisuite_llm_python extension:

• agents/examples/default/manifest.json: Added the new aisuite_llm_python extension to the manifest.
• agents/examples/default/property.json: Updated to include the new aisuite_llm_python extension and its configuration, replacing the openai_chatgpt_python extension.

Removal of outdated extensions:

• agents/examples/default/property.json: Removed the weatherapi_tool_python and openai_v2v_python extensions along with their configurations. [1] [2] [3]

Addition of new extension files:

• agents/ten_packages/extension/aisuite_llm_python/__init__.py: Added an import statement for the new extension.
• agents/ten_packages/extension/aisuite_llm_python/aisuite_llm_addon.py: Created the addon class for the new extension.
• agents/ten_packages/extension/aisuite_llm_python/aisuite_llm_extension.py: Implemented the main functionality of the aisuite_llm_python extension, including methods for handling messages, commands, and data.

Configuration and dependencies:

• agents/ten_packages/extension/aisuite_llm_python/manifest.json: Defined the properties, commands, and dependencies for the new extension.
• agents/ten_packages/extension/aisuite_llm_python/property.json: Added an empty property file for the new extension.
• agents/ten_packages/extension/aisuite_llm_python/requirements.txt: Listed the aisuite package as a dependency.