create the python sdk to return version (#1039)

### What problem does this PR solve?

Create python SDK to return the version of RAGFlow.

### Type of change

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

---------

Co-authored-by: cecilia-uu <konghui1996@163.com>

SDK/python/test/test_basic.py

@@ -0,0 +1,8 @@
+from test_sdkbase import TestSdk
+import ragflow
+import pytest
+
+
+class TestCase(TestSdk):
+    def test_version(self):
+        print(ragflow.__version__)