feat: make stats computation configurable

[berntpopp]

The statistics currently may be limited to predefined methods. Allowing users to choose different statistical methods (e.g., max, average, standard deviation) would add flexibility.
Proposed Changes:

• Introduce a --stats-method parameter with options such as max, average, stddev.
• Implement logic to compute the selected statistic on relevant data.
  Benefits:
• Users can tailor the analysis to their specific needs.
• More comprehensive and customizable analytics.
  Acceptance Criteria:
• --stats-method accepted and validated.
• Code applies the chosen method to produce statistical results.
• Documentation updated with available methods and usage examples.