* Ignore unnecessary ... error

* Add back ... to functions with docstring

* Remove from_function_call methods from FunctionResultMessage

* Add tests for message_to_openai_message

* Fix: Use FunctionCallFunctionSchema to name function in result message

* Use function instead of function_call in FunctionResultMessage

* Add test for chatprompt with function call

* Move Optional openai params to only pass if set

* Move template formatting into Message classes

* Remove *args from format methods

* Cast str to T in format methods for mypy

* Add Placeholder class for templating messages

* Fix: make type_ param bc cannot read generic arg

* Remove Message.format overloads to simplify typing

* Delete Placeholder class

* Do not format FunctionResultMessage

* Use singledispatch to make message_to_openai_message extensible

* Remove unneeded newlines

* Add test_message_to_openai_message_raises

* Test no error raised after new message type registered

* poetry update litellm

* poetry update pytest

* poetry update ruff

* poetry update everything but pydantic

* poetry update

* Skip broken pydantic test

* Add last_message property to Chat

* Add test for Chat.last_message

* Leave .copy on messages property