feat(android): types for API Level 30 and cleanup

[NathanWalker]

PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#commit-messages.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/DevelopmentWorkflow.md#running-unit-tests-application.

What is the current behavior?

API Level 30 was missing. Also the native namespace used for Android/Java typings collided with other usages.

What is the new behavior?

API Level 30 is now included. Also the native namespace used for Android/Java typings no longer collides.

BREAKING CHANGE:

If you were usingnative.Array for any of your own custom plugin typings, you can switch them to androidNative.Array

BEFORE:

public writeAsync(path: string, bytes: native.Array<number>) ...

AFTER:

public writeAsync(path: string, bytes: androidNative.Array<number>) ...

[NathanWalker]

These are currently published on @nativescript/types 7.3.0-rc.0 at moment for anyone that needs them.
It's rc since there's a very small chance the native > androidNative namespace switch could affect plugin developers.