fix(button)!: remove shadow <button>

[bennypowers]

What I did

1. remove the shadow <button> from pf-button
2. implement (hopefully all of the) button semantics on the host
3. refactor styles and whatnot to suit
4. refactor pf-chip in response to button changes

Testing Instructions

1. units, manual UX and SR testing on button and chip demos
2. manual testing on form control demos (requestSubmit should call)

Notes to Reviewers

1. I used css nesting, we might need to go back later and compile that out
2. IMPORTANT: test failures on dropdown should be addressed in fix(dropdown): slotted trigger #2703 see fix(button)!: remove shadow <button> #2707 (comment)

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Latest commit: f1ee6ff

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[bennypowers]

Failure on dropdown is likely related to dequelabs/axe-core#4259

If manual UX testing passes, I suggest we exclude this assertion and leave a comment with a link to that issue

[nikkimk]

Little Grogu the Mandalorian

[bennypowers]

You could write a book with your lagtam's, Nikki