Fix requestPermission to return false when permission is denied

[nan-li]

Description

One Line Summary

Return the correct boolean for the requestPermission method when permission denied, and resolve correctly if permission is already granted.

Details

Motivation

This was reported by a GitHub issue and I was able to reproduce. This method was always returning true previously on denial.

In addition, we were not resolving if permission is already granted due to the Android implementation of suspend functions.

Scope

• We used to return result.isSuccess() which always returns true because this is whether the coroutine call was successful.
• Instead return result.getData() which holds the value returned by the coroutine.
• If the coroutine is not successful, we get the Throwable's message and pass that along.
• Also add a button to get permission native in example app to facilitate testing.
• Now, we also resolve correctly when permission has already been granted.

Testing

Unit testing

None

Manual testing

Android emulator API 33

• Tested the boolean returned when permission is accepted and denied and it returns true and false respectively.
• Tested combinations of toggling permissions in app settings and calls to requestPermission.

Affected code checklist

• Notifications
  • Display
  • Open
  • Push Processing
  • Confirm Deliveries
• Outcomes
• Sessions
• In-App Messaging
• REST API requests
• Public API changes

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
• Any Public API changes are explained in the PR details and conform to existing APIs

Testing

• I have included test coverage for these changes, or explained why they are not needed
• All automated tests pass, or I explained why that is not possible
• I have personally tested this on my device, or explained why that is not possible

Final pass

• Code is as readable as possible.
• I have reviewed this PR myself, ensuring it meets each checklist item

---

This change is