Components: Split stories and test files into separate projects

[sirreal]

What?

I did some TypeScript analysis and found that most TypeScript compilation time is spent on the components package. Some very costly compilation was in stories.

Why?

I wanted to try to split out stories (and tests) for a few reasons:

• The use an environment that is not suitable for application code with jest, node, and other globals.
• There's no reason to emit anything (including declarations) for stories and tests. We can typecheck them, but nothing consumes the types so we can save the emit.

How?

Split into a separate project.

Testing Instructions

CI passes.
Look at some stories in an editor with TypeScript integration. Does everything seem OK?