Core: Renderer refactor

[shilman]

Issue:

What I did

This PR introduces the concept of a renderer which is the builder-independent pieces to support a view layer, plus the docs preview code (for now)

• renderToDom (required) - render the result of a render function to the DOM
• render (optional) - the default CSF3 render function when the user doesn't provide one, e.g. export Story = { args: { ... } }

The renderers are also presets, introduced in telescoping PR #18004, which has now been merged.

How to test

• CI passes

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