Csf-plugin: Support meta description comments

[shilman]

Issue: N/A

What I did

Support component descriptions as JSDoc comments on the meta export.

/** some description */
export default { .... }

/** some description */
const meta = { ... }
export default meta;

How to test

See attached unit tests.

Or add a description comment to a CSF file that has autodocs.

[JReinhold]

Looks good. I don't know why Chromatic isn't reporting any changes to the Description block as there clearly are changes. I'll investigate.

[JReinhold]

Turbosnap was ignoring the changes to the Description stories because there was no direct line of dependencies between enrichCsf and the stories. this makes sense.
I forced a build from local and it picked up the changes.

Everything is good.