🧹 [code health improvement] Refactor long didUpdateWidget in MKMapView

[google-labs-jules]

🎯 What: The code health issue addressed
The didUpdateWidget function in lib/src/mk_map_view.dart was too long, handling updates for configuration, dispatch tables, annotations, polylines, polygons, and circles all in one place.

💡 Why: How this improves maintainability
Extracting these updates into smaller, specific private helper methods (_updateDispatchTables, _updateConfiguration, _updateAnnotations, etc.) makes the code more readable and easier to maintain. This clarifies the intent of the updates in didUpdateWidget and reduces its complexity.

✅ Verification: How you confirmed the change is safe
I ran dart format . && flutter analyze && flutter test. All tests passed, confirming that the original logic and behavior remain intact without any regressions.

✨ Result: The improvement achieved
A cleaner, more modular MKMapView implementation, enhancing code quality and making it easier for future developers to navigate and modify.

---

PR created automatically by Jules for task 12957297461528161513 started by @esenmx

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.