Vibration in background

# Feature Request

## Motivation Behind Feature
Using background vibration will be great for apps that want to get the user’s attention.

## Feature Description
Possibility to perform vibration when the application is in the background.

## Alternatives or Workarounds
I tried use Background plugin but doesn't work.

The issue names no files, tests, or entry points. Start by reviewing the plugin's existing platform implementations and the background-plugin limitation described in the report; done means documenting or implementing a defined way for applications to vibrate while backgrounded.

Written by the indexing model from the issue text.