Add new OptionButton component

[lyzadanger]

This PR adds a new OptionButton component. It is a semi-generalized implementation of the new button we need to satisfy hypothesis/lms#2955

I ended up creating a new button that is intended for use "when you might otherwise use a radio button or select element but you need a button instead." In full purity, the set of buttons in the LMS content-selection interface that we're targeting should maybe instead be radio buttons or a select element. But it's impractical to make that big of a change right now, so this component serves as an option-like button.

It takes an optional details prop (for content to render at the right edge of the button), aliases selected to pressed and otherwise forwards all other non-styling props to Button. Eh, the pattern-library docs explain this more clearly.

I've also updated the pattern-library prototype page for LMS content selection to use this component.

[codecov]

Codecov Report

Merging #1065 (13a9c76) into main (0a10b93) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #1065   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files           53        54    +1     
  Lines          741       750    +9     
  Branches       270       276    +6     
=========================================
+ Hits           741       750    +9     

Impacted Files	Coverage Δ
src/components/input/OptionButton.tsx	100.00% <100.00%> (ø)

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[acelaya]

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