Fixed `LaunchNavigator.navigate` never resolving the returned promise when AppleMaps/MapKit is used on iOS

[IjzerenHein]

The promise returned from LaunchNavigator.navigate never resolved when using MapKit on iOS. This made it impossible/unreliable to test for errors. This PR fixes that issue by implementing a completion handler, much in the same way the schema launch operations are handled.

PR Type

What kind of change does this PR introduce?

• [X] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Documentation changes
• [ ] Other... Please describe:

PR Checklist

For bug fixes / features, please check if your PR fulfills the following requirements:

• [X] Testing has been carried out for the changes have been added
• [X] Regression testing has been carried out for existing functionality
• [X] Docs have been added / updated (not relevant)

What is the purpose of this PR?

Does this PR introduce a breaking change?

• [ ] Yes
• [X] No

What testing has been done on the changes in the PR?

It has been verified that the promise returned from LaunchNavigator.navigate not successfully resolves using provider id LaunchNavigator.APP.APPLE_MAPS and launchMode LaunchNavigator.LAUNCH_MODE.MAPKIT.

[dpa99c]

Thanks. The changes are obvious and logical so will merge this straight in.

[IjzerenHein]

Sweet!

Great library btw, kudos! 👍 👍