* Add support for getting and creating Assistant and Foundry agents with ChatClientAgentOptions
* Fix options cloning and agent creation
* Fix inconsistency
* Add support for mapping more tools and integration tests for ensuring CreateAIAgent works with those tools.
* Add support for additional openai tools with tests.
* Remove special casing for function tools, since it's either not supported yet, or requires a lot of code duplication.
* Removed unused using.
* Fix broken unit tests
* Change integration test to reduce flakiness.
westey