feat: add MongoDB test generation and update dependencies

- Added pymongo==3.13.0 to requirements.txt for MongoDB connectivity
- Implemented generate_summarization_from_mongo.py script to generate summarization tests from MongoDB
- Updated run.sh to support 'gen-mongo' command for MongoDB test generation
- Enhanced scripts/README.md with documentation for new MongoDB functionality
- Improved help text in run.sh to clarify available commands and usage examples
```

This commit adds MongoDB integration for test generation and updates the documentation and scripts accordingly.

tests/codegen/test1.txt

@@ -0,0 +1,7 @@
+Write a Python function that calculates the factorial of a number using recursion.
+==============
+def factorial(n):
+    if n == 0 or n == 1:
+        return 1
+    else:
+        return n * factorial(n-1)