Add scheduled user-role backup and management CLI

[trepmal]

Description

Adds 1) a cron job to regularly backup user roles to a secondary option and 2) a CLI to manage listing/viewing/restoring those backups to the primary.

Why? In some cases of option corruption, user roles are lost and restoration is complicated and/or slow. This intends to make it quick and easy.

Note: this deals with the wp_user_roles option, not the assignments to users.

Changelog Description

Added User Role Backups

This change adds an automated daily backup of the user roles option that can be used to recover roles if they are corrupted. It also adds some CLI commands to aid in managing these backups.

Checklist

Please make sure the items below have been covered before requesting a review:

• This change works and has been tested locally (or has an appropriate fallback).
• This change works and has been tested on a Go sandbox.
• This change has relevant unit tests (if applicable).
• n/a This change has relevant documentation additions / updates (if applicable).
• I've created a changelog description that aligns with the provided examples.

Steps to Test

Begin by backing up current roles, then alter roles and backup again:

wp cron event run 'Automattic\VIP-backup_roles'
wp role delete editor
wp role delete author
wp role delete contributor
wp cron event run 'Automattic\VIP-backup_roles'

A couple options will now be listed in wp vip role-backup list

1. optionally view a backup: wp vip role-backup view [<time_key>]
2. and restore: wp vip role-backup restore [<time_key>]
3. and confirm: wp role list

[WPprodigy]

Tested pretty extensively, all went well.

[WPprodigy]

Should we prefix this with VIP_? And also, just curious if there would be any harm in upping this to say 5 - since we aren't autoloading it shouldn't matter, and will better help protect against maybe a weekend problem that went unnoticed for 3 days?

[nickdaugherty]

@WPprodigy this file is namespaced so that'll also cover the constant.

[nickdaugherty]

Tested it all out and it works great!

[nickdaugherty]

r1391-stacks