[ET-1564] Common > Add Toggle Settings Field

[codingmusician]

Ticket

ET-1564

Description

We're adding a "toggle" setting element that acts like the checkbox, except it is styled to look like a switch.

Artifacts

Checklist

• [x] I've included a changelog entry in the readme.txt file.
• [x] My code is tested.
• [x] My code has proper inline documentation.