Feat: optimize aws s3 connector (#12078)

### What problem does this PR solve?

Feat: optimize aws s3 connector #12008 

### Type of change

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

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

common/data_source/blob_connector.py

@@ -64,15 +64,23 @@ class BlobStorageConnector(LoadConnector, PollConnector):
 
         elif self.bucket_type == BlobType.S3:
             authentication_method = credentials.get("authentication_method", "access_key")
+
             if authentication_method == "access_key":
                 if not all(
                     credentials.get(key)
                     for key in ["aws_access_key_id", "aws_secret_access_key"]
                 ):
                     raise ConnectorMissingCredentialError("Amazon S3")
+
             elif authentication_method == "iam_role":
                 if not credentials.get("aws_role_arn"):
                     raise ConnectorMissingCredentialError("Amazon S3 IAM role ARN is required")
+                
+            elif authentication_method == "assume_role":
+                pass
+
+            else:
+                raise ConnectorMissingCredentialError("Unsupported S3 authentication method")
 
         elif self.bucket_type == BlobType.GOOGLE_CLOUD_STORAGE:
             if not all(
@@ -293,4 +301,4 @@ if __name__ == "__main__":
     except ConnectorMissingCredentialError as e:
         print(f"Error: {e}")
     except Exception as e:
-        print(f"An unexpected error occurred: {e}")
+        print(f"An unexpected error occurred: {e}")