Update Python deserialization documentation and add unit test

[lshep-bf]

Add more examples and sections to Insecure Deserialization/Python.md and create a new test file test_python_md.py.

• Insecure Deserialization/Python.md:

  • Add examples of vulnerable code snippets and their secure alternatives for pickle and PyYAML.
  • Include a section on common pitfalls and how to avoid them when using deserialization in Python.
  • Provide a list of tools and libraries that can help detect and prevent insecure deserialization in Python applications.
  • Add references to relevant documentation, articles, and research papers for further reading.
  • Include a section on how to test for insecure deserialization vulnerabilities in Python applications, including both manual and automated testing techniques.

• test_python_md.py:

  • Import the unittest and re modules.
  • Create a test case that reads the Insecure Deserialization/Python.md file.
  • Extract the Python code blocks from the markdown file.
  • Execute each code block and check for any exceptions.

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