Classes to ease creation of UI sketches

When creating a UI sketch, we often have a prefab we want to attach to a canvas for inspection, this requires most projects to the hand craft a mechanism for creating the canvas in code. This is not overly burdensome but is redundant. In the case of a project using the new UI system it is far less straightforward.

This could take the form of a base class or static factory style function.

Start by locating the existing UI sketch workflow, prefab attachment path, and code that creates canvases, then compare how the new UI system is handled. Define the reusable class or factory's scope and verify that a prefab can be attached to a canvas for inspection without project-specific setup.

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