fix: strip func in cli (#74)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Bug Fixes**
- Improved handling of input strings in the CLI by trimming spaces
before parsing. This prevents errors due to unexpected whitespace.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

dargs/cli.py

@@ -90,7 +90,7 @@ def check_cli(
     dict
         normalized data
     """
-    module_name, attr_name = func.rsplit(".", 1)
+    module_name, attr_name = func.strip().rsplit(".", 1)
     try:
         mod = __import__(module_name, globals(), locals(), [attr_name])
     except ImportError as e: