Update Peak Cadence Calculations to Remove Thresholds

[ashreves]

Request to update the package to remove the current thresholds for peak cadence calculations. Specifically:

Peak 1-Minute Cadence:

• Current: Requires a 10-minute threshold.
• Update: Identify the highest step count minute of the day without applying any threshold.

Peak 30-Minute Cadence:

• Current: Requires a 30-minute threshold.
• Update: Use the highest 30 minutes of the day, even if they are not continuous. If a participant has fewer than 30 active minutes, use their available most active minutes.

This change aligns with analysis approaches like those used by Saint-Maurice et al., which rank-orders step data to focus on the most active minutes rather than enforcing thresholds.