chore: add ty + pre-commit hook and repeal even more ruff rules (#9504)

* auto fixes

* auto fix pt2 and transitive deps and undefined var checking locals()

* manual fixes (ignored or letta-code fixed)

* fix circular import

* remove all ignores, add FastAPI rules and Ruff rules

* add ty and precommit

* ruff stuff

* ty check fixes

* ty check fixes pt 2

* error on invalid

tests/test_google_embeddings.py

@@ -2,14 +2,13 @@ import httpx
 import pytest
 from dotenv import load_dotenv
 
-from letta.embeddings import GoogleEmbeddings  # Adjust the import based on your module structure
+from letta.embeddings import GoogleEmbeddings  # type: ignore[import-untyped]  # Adjust the import based on your module structure
 
 load_dotenv()
 import os
 import threading
 import time
 
-import pytest
 from letta_client import CreateBlock, Letta as LettaSDKClient, MessageCreate
 
 SERVER_PORT = 8283