[REQ] New python client generator which exports the api funcs as langchain tools

Is your feature request related to a problem? Please describe.

I had this use case in my org where I need to provide an ai agentic chatbot over a basic crud server. Wanted to auto generate the langchain tools as they can be done using the openapi spec offered by the server easily. Think having a generator here would be useful in general as well.

I saw a thread regarding MCP server but this is specifically for tools

Describe the solution you'd like

• Introduce a new generator named python-langchain-tools.
• The PythonLangchainToolsClientCodegen class for this will extend the PythonClientCodegen and utilize it for client generation.
• The new PythonLangchainToolsClientCodegen class would just create additional files which will import the clients and export them as lang chain tools

Describe alternatives you've considered

• creating new type of generators apart from client and servers but tools are just a facade over clients so I think this would be good enougth to start with

Additional context

I have already implemented this in my local in a non platformized way using the approach mentioned above. If the community thinks this is plausible, can create a PR as well

Start by reading the existing PythonClientCodegen class and how client generators are organized. The proposed generator is named python-langchain-tools and should extend PythonClientCodegen while adding files that import the generated clients and expose them as LangChain tools. Done means the new generator can produce both the Python client and these tool files.