Provide access to the Android runtime to GDScript

Thanks for the fix of `JavaClassWrapper` in https://github.com/godotengine/godot/pull/96182 and the changes in the previous commit, this introduces an `AndroidRuntime` plugin which provides GDScript access to the Android runtime capabilities.

This allows developers to get access to various Android capabilities without the need of a plugin.
For example, the following logic can be used to check whether the device supports vibration:

```
var android_runtime = Engine.get_singleton("AndroidRuntime")
 if android_runtime:
 	print("Checking if the device supports vibration")
 	var vibrator_service = android_runtime.getApplicationContext().getSystemService("vibrator")
 	if vibrator_service:
 		if vibrator_service.hasVibrator():
 			print("Vibration is supported on device!")
 		else:
 			printerr("Vibration is not supported on device")
 	else:
 		printerr("Unable to retrieve the vibrator service")
 else:
 	printerr("Couldn't find AndroidRuntime singleton")
```

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