In package.json, cordova plugin list is never sorted

# Bug Report

## Problem
In package.json, cordova plugin list is not sorted. Makes things hard to understand when adding new plugins.


### What is expected to happen?
Object keys should be sorted alphabetically.

### What does actually happen?
They're never sorted.

## Information

### Command or Code

### Environment, Platform, Device

### Version information

macOS High Sierra
Cordova 9.0.0

## 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 package.json and locate the Cordova plugin list. Sort its object keys alphabetically and verify that the resulting package.json presents the plugins in the expected order.

Written by the indexing model from the issue text.