This lets us use the functionality of `register_block_type` to automatically enqueue the scripts and styles used by blocks in the editor, and eventually, styles on the frontend as well. Also adds cssnano to minify our CSS.
* Add initial attribute selector control
* Make the attribute group name unselectable
* Update selected map to reflect attribute syntax
* Add the attributes selector to the product category block
* Update copy-paste comment
* Update variable name to be more clear
* Move & rename the attribute selector in Products by Category
* Reorganize the API calls to fetch attributes + attribute terms
* Add new SearchListItem component
Extract the custom functionality from product categories, for re-use in product attributes
* Fix error when no breadcrumbs are set
* Update snapshot
* Remove unnecessary key
* Always show the selected tags section, with a min-height to prevent jumping when selecting tags
* Only show the “clear all” button if there are selected items
* Update snapshot tests
* Update height for sidebar category selection
* Add new components for ProductCategoryControl, using a reusable SearchListControl
* Add sass variables from wc-admin
* Finish styling
* Save selected categories as selected for the block
* Style sidebar version of control
* Filter the categories list, highlight search term in result
* Filter out selected items in the filter list function
* Add spacing in the placeholder, remove unnecessary stylesheet
* Add a more descriptive label for screen readers
* Remove category references from list item options
* Switch to a configurable object of messages, so SearchListControl can be more customizable
* Add screen-reader message for toggling “done” and moving into preview
* Remove call to getProductCategoryControl
The component is simple enough to just drop in now :)
* Add documentation for all props
* Add padding to placeholder
* Rename fallbackrenderItem to defaultRenderItem
* Add a variable to save the selected count
* Add `isDestructive` to make link red
* Update item style
* Add a hover/focus background color