[iOS] Audio stream (http) keeps playing when app/page reloads

# Bug Report

## Problem
On iOS, when playing a remote audio stream (e.g. HTTP) and reloading the page content, the audio playback keeps playing and there's no way to stop it from JS, except killing the app.

### What is expected to happen?
Audio should stop on app reset (like on Android).

### What does actually happen?
Audio keeps playing on app reset.

## Information
This is somewhat related to https://github.com/apache/cordova-plugin-media/issues/294, although the cause is slightly different: `onReset` does not clean-up `avPlayer` and only takes care of local sounds (where `audioFile.player` is not `nil`).

### Version information
- cordova-plugin-media 5.0.4
- iOS 15

## Checklist

- [x] I searched for existing GitHub issues
- [x] I updated all Cordova tooling to most recent version
- [x] I included all the necessary information above

Inspect the iOS onReset handling and the avPlayer cleanup path mentioned in the issue, then compare it with the Android reset behavior. Reproduce the problem with an HTTP audio stream and a page reload; the work is done when app reset stops playback and it can be controlled again from JavaScript.

Written by the indexing model from the issue text.