feat: Enable getting a tool from a ToolKit by tool_name and listing the available tool_name_list

[yiyiyi0817]

Description

I implemented enabling getting a tool by tool_name and listing the available tool names in BaseToolkit by adding list_tools(self) -> List[str] and def get_a_tool(self, func_name: str) -> List[OpenAIFunction]: methods.

Currently, since OpenAPIToolkit does not inherit from BaseToolkit, thus it cannot use the list_tools and get_a_tool functions. This may necessitate further discussion on whether OpenAPIToolkit should inherit from BaseToolkit.

Motivation and Context

• I have raised an issue to propose this change ([Feature Request] Enable getting a tool from a ToolKit by tool_name and listing the available tool_name_list #946 for new features and bug fixes)

Types of changes

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Example (update in the folder of example)

Checklist

Go over all the following points, and put an x in all the boxes that apply.
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• I have read the CONTRIBUTION guide. (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly. (required for a bug fix or a new feature)
• I have updated the documentation accordingly.