feat: Update package and example

[Evgenia-bit]

Checklist

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [x] Is there an existing issue for this PR?
  • https://github.com/surfstudio/flutter-push-notification/issues/16
• [x] Have the files been linted and formatted?
• [x] Have the docs been updated to match the changes in the PR?
• [x] Have the tests been updated to match the changes in the PR?
• [x] Attached videos/screenshots demonstrating the fix/feature.
• [x] Have you run the tests locally to confirm they pass?

New Features

What new capabilities does this PR add?

• _getStrategyBuilder in PushHandleStrategyFactory now processes messageData the same on both ios and android
• enum MessageHandlerType has been updated to reflect the changed message handlers in FirebaseMessaging. onLaunch and onResume removed, onBackgroundMessage and onMessageOpenedApp added.
• fixed parsing error in the internalOnSelectNotification method in NotificationController
• handleMessage in PushHandler method has been updated to match the updated MessageHandlerType
• fixed the problem of incorrect display of push notifications on iOS
• improved example
• updated docs: no longer need to specify click_action: FLUTTER_NOTIFICATION_CLICK in notification and add intent-filter to android manifest
• updated tests

Android:

https://github.com/surfstudio/flutter-push-notification/assets/63193897/cbdf6a9c-b7cd-46a4-b315-9a8d963516c4

IOS:

https://github.com/surfstudio/flutter-push-notification/assets/63193897/6ee5d04e-9650-4175-b259-d623316ddf3d

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (f23b9e2) to head (01c72bf). Report is 12 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #41 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 13 13 Lines 156 148 -8 ========================================= - Hits 156 148 -8 ```

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