Added the Python Client for Anton

[MinuraPunchihewa]

This PR adds a client module for Anton. This enables Anton to be called easily via other Python applications (like the Minds API) while maintaining certain session specific parameters such as message history and scratchpad manager.

This also enables custom tools to be defined for Anton. This was mainly done with the intention of passing through a tool that will allow Anton to query data sources in Minds (via MindsDB).

import asyncio

from anton import Anton

anton = Anton()

asyncio.run(anton.chat("Hi"))
# OR
def stream(prompt: str):
  async for event in anton.chat_stream(prompt):
    print(event)

asyncio.run(stream("Hi"))