* Allow plugins API to install multiple plugins at once
* Update wpdata to handle installing multiple plugins and errors
* Remove client-side error message switch
* Update plugin tests for multiple plugins param
* Update plugins API to WP standards
* Add error for non-allowed plugins instead of silently failing
* Allow error handling for individual plugins
* Fix up js tests for new API response
* Add installed plugin to response on successful install
* Plugins DataStore: decouple from onboarding (https://github.com/woocommerce/woocommerce-admin/pull/4048)
* Plugins DataStore: Add client side store
* change active_plugins to public static function
* don't change shape of allowed plugins
Joshua T Flowers
Paul Sealock