Add unit tests for Statistics class (✓ Sandbox Passed)

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Description

This pull request adds unit tests for the Statistics class to ensure its functionality and accuracy.

Summary

• Added unit tests for Statistics class in tests/test_statistics.py
• Created TestStatisticsGetStats and TestStatisticsUpdate classes to test get_stats and update methods
• Tested success rate calculation with different scenarios
• Ensured accurate updating of success and total counts

Fixes #18.

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Sandbox Executions

• [X] Ran sandbox for tests/test_statistics.py. ✓

  Sandbox logs for

poetry run pylint -E **/*.py 1/1 ✓

(nothing was outputted)

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