feat: add showCallout and hideCallout methods to Marker

[lodev09]

Summary

Add programmatic showCallout() and hideCallout() methods to the Marker component via ref. Shows callout in place without camera animation. No-op if no callout or title is set.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Test Plan

• Call markerRef.current?.showCallout() to programmatically show a marker's callout
• Call markerRef.current?.hideCallout() to dismiss it
• Verify no onPress event is emitted when showing callout programmatically (Apple Maps fix included)
• Example app: "Move Camera" button now also shows the target marker's callout

Checklist

• I tested on iOS
• I tested on Android
• I tested on Web
• I updated the documentation (if needed)