perf: ⚡️ Enhance & update the main code snippet files

[yashksaini-coder]

✅ Closes: #458

This pull request includes significant additions and improvements to the unit tests for various library snippets, as well as type hinting enhancements in the corresponding library files. The most important changes include the addition of comprehensive unit tests for matplotlib, numpy, pandas, and requests snippets, and the addition of type hints to improve code readability and maintainability.

Unit Tests Additions:

• Matplotlib Tests:

  • Added unit tests for line and bar plot creation in Tests/library_snippets/test_matplotlib_snippet.py.

• Numpy Tests:

  • Added unit tests for array addition and multiplication in Tests/library_snippets/test_numpy_snippet.py.

• Pandas Tests:

  • Added unit tests for DataFrame filtering and saving in Tests/library_snippets/test_pandas_snippet.py.

• Requests Tests:

  • Added unit tests for fetching and parsing HTML content in Tests/library_snippets/test_requests_snippet.py.

Type Hinting Enhancements:

• Matplotlib Snippet:

  • Added type hints to all plotting functions in library_snippets/matplotlib_snippet.py.

• Numpy Snippet:

  • Added type hints to all mathematical operations in library_snippets/numpy_snippet.py.

• Pandas Snippet:

  • Added type hints to DataFrame operations in library_snippets/pandas_snippet.py.

• Requests Snippet:

  • Added type hints to HTML fetching and parsing functions in library_snippets/requests_snippet.py.

@UTSAVS26 Kindly review this PR, and assign it level 3 it is my request to you.

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