* Update OpenTelemetryAgent to latest spec
It was stale. Rather than try to keep it up-to-date manually, I've changed it to piggy back on OpenTelemetryChatClient, so that it inherits everything OpenTelemetryChatClient does and then augments it just with agent-specific tags.
* Address feedback / merge
This document provides comprehensive transparency information about Microsoft Agent Framework, including intended uses, limitations, evaluation methods, and responsible development practices.
* Make serialize methods sync and rename one to match others.
* Remove unnecessary async postfixes.
* Remove nullability of ChatMessageStore.Serialize return type, since the default JsonElement already represents an undefined json element.
* Fix unit test
* consolidate lab packages into a single one; update contribution guidelines
* update dep list
* add poe tasks; fix tests and lint erros
* add lab tests for CI
* fix test
* update root pyproject.toml
* Disallow execution of multiple workflows at once
* Define notion of executor Reset() to allow reuse of workflows with shared executor instances
* Switch to delivering all messages to a single executor sequentially, with executors running in parallel
* Added example with stateful middleware
* Added chat middleware
* Updated middleware example with override scenario
* Small revert
* Small fixes
* Added kwargs to context objects
* Added README
* Added function middleware to chat client
* Small refactoring
* Reverted example files
* Made MiddlewareWrapper generic
* Added Middleware exception
* Small refactoring
* Small fix