Designer: Added feature to create interactive component states

[bheston]

Pull Request

Description

In the Figma Designer, a new feature when you select a component state, to create the interactive state variants automatically (hover, active, focus, and disabled).

Reviewer Notes

A portion of this work updates the messaging model between the plugin and the UI. Previously we only had one type of message, which was component styling state back and forth. Updated to support multiple types of messages and added a new one for the "create states" message.

Test Plan

Tested in Figma.

Checklist

General

• I have included a change request file using $ npm run change
• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation for this project.

⏭ Next Steps

I think I can clean up the need to manage the serialization by removing the use of maps. Everything else should serialize correctly by default.