Add alertcondition() calls for major events in Peak Reversal indicator

[Zettt]

Summary:
Add alertcondition() calls to the Peak Reversal indicator script (Peak Reversal.pine) to allow users to automate their trading strategies based on key events.

Tasks:

1. Identify key events:
   • Band crosses (upwards/downwards)
   • Re-entries into bands after deviations
   • Squeeze starts (when volatility drops below threshold)
   • Squeeze ends (when volatility rises above threshold)
   • Free bar breakouts (full candle outside bands)
   • Any other significant signal already plotted or color-coded
2. Implement alertcondition() calls:
   • For each identified event, add a corresponding alertcondition() in the script
3. Add descriptive messages:
   • Each alert should have a clear, customizable message describing the event and context (e.g., band crossed up, squeeze started, etc.)

Acceptance Criteria:

• All major events in the indicator have a corresponding alertcondition().
• Alert messages are descriptive and easy to modify by the user.
• Code is commented and organized for maintainability.

File: Peak Reversal.pine

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This enhancement will significantly improve the script's usability for automated trading and alerting.