Improve RAD capabilities

### Description

Support for RAD (Rapid Application Development) is something that would make dashboard 2 even more attractive.

Wigitize / Dynamo are familiar methods of RAD in HMI editors and something that is sorely missed in Node-RED dashboarding. These methods permit the user/OEM to make standard groups of elements for fast and familiar layouts. Upon using this "dynamo", they are prompted for placeholder values. A similar construct in Node-RED is subflows.

The benefits of this functionality include:
1. one time setup of complex sets of UI element groups
2. simple re-use of above mentioned UI groups
3. update once, fix all implementations
4. faster and more accurate screen development

This epic aims to address part or all of this.

Additionally, it is to raise awareness of these ideals so as to make suitable/compatible choices when introducing new widgets for dashboard.

_stories and tasks to follow_

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate