feat: add py.typed, Ray handles for clients, and pre-commit config

- Add py.typed marker for PEP 561 type hint support
- Add ray_utils module for Ray handle detection and caching
- Update all clients (Embeddings, LLM, TTS, STT, Reranker) to use
  Ray handles when running inside Ray cluster for faster internal calls
- Add .pre-commit-config.yaml with ruff and standard hooks
- Add pre-commit and ray[serve] to optional dependencies
- Bump ruff version to 0.4.0

pyproject.toml

@@ -45,7 +45,11 @@ dev = [
     "pytest>=8.0.0",
     "pytest-asyncio>=0.23.0",
     "pytest-cov>=4.0.0",
-    "ruff>=0.1.0",
+    "ruff>=0.4.0",
+    "pre-commit>=3.7.0",
+]
+ray = [
+    "ray[serve]>=2.9.0",
 ]
 
 [build-system]