Create ability to pass in components into the editor

[Sebastian-ubs]

User Story
As a developer, consuming the editor, I want to be able to pass in components into the editor so that I will be able to design complex components independently.

Description
Examples include components for

• comments
• checks
• the toolbar

Implementation idea

• the editor needs to be able to accept components as properties
• data flow and storage must be considered
• think about localization

[Sebastian-ubs]

alternatively, based on paranext/paranext-core#1220 (comment):

• the ability to completely hide existing controls (maybe already possible via css)
• the ability to register and redirect hooks like copy, paste, add comment, ... to a consumer of the editor