ActionList Component: Primer CSS Implementation (#1657)

* add storybook, start actionlist

* story composition, some katie edits

* auto grid test

* one grid option

* you win flexbox, you win

* back on that grid grind

* story for each item context

* import stories

* add CSS friendly args for controls

* more conditionals

* push

* fix import

* clean up deps

* fix borders + hover state

* add navigational to story

* primitive-ize

* break out files

* a11y fix

* list stories

* add all theme viewer, more css edge cases

* story cleanup

* actionList becomes ActionList

* story syntax improvements

* bind stories, organize

* nested nav exploration

* pseudo hover to support nested lists

* cleanup

* organize pattern stories

* finding a better way to deal with state/nesting

* move state up one level

* handle single level nesting

* collapsible

* collapse story in sub item nav

* new collapse icon position, grid refactor

* toggle expanded state

* cleanup

* rename classes, better nesting, single select

* multi select support

* start docs!

* new animations

* docs

* more docs

* action item features docs

* a11y docs (storybook)

* fix docs codeblocks

* format code snippet (a little)

* pull in pre-release primitives

* fix danger primitive

* cleanup

* linting playing tricks on me

* linty fresh

* renaming classes fun times

* add disabled variant

* formatting struggles

* danger visual danger color

* add viewport maps to layout vars

* test stylelint

* finish docs

* revert primitive upgrade

* primitives patch take 2, sidebar story

* change calc function

* remove fix script

* lint, docs fixes

* Stylelint auto-fixes

* guessing the storybook link for docs

* testing scss imports

* lint

* default background

* handle padding for sizes

* remove comments

* Stylelint auto-fixes

* Create poor-walls-occur.md

* Update poor-walls-occur.md

Co-authored-by: Jon Rohan <yes@jonrohan.codes>
Co-authored-by: Actions Auto Build <actions@github.com>

Author: 3 people

.changeset/poor-walls-occur.md

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+"@primer/css": minor
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+ActionList Component: Primer CSS Implementation. Adding a new component `ActionList` to learn more checkout the docs [https://primer.style/css/components/action-list](https://primer.style/css/components/action-list).