AI Functions.

[FayazRahman]

• loopgpt.aifunc decorator allows us to write AI functions with documentation only, and it can return python literals.
• Use loopgpt.set_aifunc_args to set which model and embedding provider AI functions would use.
• No need to write properties for tools anymore, just write docstrings.
• Tools required by an agent has to specified when initializing an agent, Agent(tools=[...])
• Agents can "watch" tools or AI functions being executed if they are executed in the with context of an agent.
• with agent.query(...) can be used to control the context of the agent for any purpose.
• with agent.complete(...) can be used to add additional history for the agent.