satoren / y_ex / fb7c3089e5bc891e8119b1c505e513e05b38d91a-PR-222

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main: 99%

Pull #222

github

feat: Add observe and observe_deep callback-based event handlers

Add callback function-based event handler registration functions to shared type modules:
- Array, Map, Text, XmlElement, XmlFragment, and XmlText
- observe: Subscribe to events with a callback function
- observe_deep: Subscribe to deep events with a callback function

This provides an alternative to the existing Subscription-based approach,
allowing simpler event handling patterns for user applications.

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