Android Support: Push Notifications

## What problem does this solve or what need does it fill?

My game use network communications to bring new data, and I want to use push notifications with Bevy app. How to do this?

## What solution would you like?

Any tips, example, or something else about current support of pushes.

## Additional context

I am new to Bevy ecosystem, but I didn't get how to use pushes.

The issue names no files, tests, or entry points. Start by reviewing Bevy's current Android support and how push notifications could fit a Bevy app, then define the required support or guidance and a concrete way to verify it works.

Written by the indexing model from the issue text.