Child Process

## Plugin Request

**Name**: Child Process
**Package**: `@capacitor-community/child-process`

### Platform(s)

Android

### Existing Solutions

https://github.com/petervojtek/cordova-plugin-shell-exec

### Description

Provide a way to create child processes in Android.

AKA:
- Shell access
- Command-line programs
- Unix executable

Start by reviewing the proposal description and the linked cordova-plugin-shell-exec project to understand the requested Android child-process and shell-access scope. Done means an agreed plugin design and implementation that provides the requested Android functionality, with its supported command-line use cases documented.

Written by the indexing model from the issue text.