Add Android 13 receive notification permission

[Fernandomr88]

Since SDK 33 android requires to ask for permission to receive notifications. Adding that permission to AndroidManifest.xml is required.

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...)

docs update

⤵️ What is the current behavior?

🆕 What is the new behavior (if this is a feature change)?

💥 Does this PR introduce a breaking change?

🐛 Recommendations for testing

📝 Links to relevant issues/docs

https://developer.android.com/develop/ui/views/notifications/notification-permission#declare

🤔 Checklist before submitting

• I made sure all projects build.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy.
• I updated CHANGELOG.md to add a description of the change.
• I followed the style guide lines (code style guide).
• I updated the relevant documentation.
• I rebased onto current master.

[orestesgaolin]

Is it enough to ask for notification permissions?

[wujek-srujek]

@orestesgaolin It is not enough, it is a 'dangerous' permission (https://developer.android.com/reference/android/Manifest.permission#POST_NOTIFICATIONS) and needs to both be declared in manifest AND be requested at runtime (https://developer.android.com/develop/ui/views/notifications/notification-permission#declare).