Introduced beartype (#3460)

### What problem does this PR solve?

Introduced [beartype](https://github.com/beartype/beartype) for runtime
type-checking.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

sdk/python/ragflow_sdk/__init__.py

@@ -1,3 +1,6 @@
+from beartype.claw import beartype_this_package
+beartype_this_package()  # <-- raise exceptions in your code
+
 import importlib.metadata
 
 __version__ = importlib.metadata.version("ragflow_sdk")