feat: --stencil now outputs default & description for attributes

[Kai-Richardson]

Fixes #285

The stencil plugin now correctly populates the artificially created attribute for a field with default and description from the detected member (if present), where it did not before:

stencil code	output

I investigated using handleDefaultValue per #285 (comment), but I don't think that function applies.

This is an artificially created attribute being injected into the class, and since handleDefaultValue is already ran to obtain the resultant values we see in the member already, we just need to copy values over to our artificial object.

I tested this locally on my custom stencil elements and it all seemed to work as expected. Members which did not have a default value nor description did not create extant fields in the produced attributes:

(no default, no desc)	(no default, no desc)

I also cleaned up some errant whitespace.

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[Kai-Richardson]

Weird - didn't encounter these test failures when running locally. I'll investigate.