feat: add explicit method registration to worker with type checking a…

[maffettone]

Description

• Adds register_method function in server utils. This includes dynamic type checking and inference from signatures.
• Adds 3 endpoints to app (and RPC handlers, and server_resources) for getting all methods, getting a single method detail, and posting/calling a method.
• Expands agent_sim to leverage register_method.
• Fixes server:app to use lifespan instead of deprecated shutdown/startup events.
• Adds tests for the server

Motivation and Context

Previous hack was using register_variable with lambda functions in setters to provide a POST endpoint. This treats arbitrary agent methods as first class for registering to the server.

Summary of Changes for Release Notes

Fixed

deprecated startup/shutdown events in fastapi

Added

arbitrary method registration for agent objects

Changed

Removed

How Has This Been Tested?

pytest and demo