feat: add skeleton for cv search component

[Pablodotnet]

Add skeleton to CvSearch component #167

Changelog

A packages/core/src/components/cv-search/cv-search-skeleton.vue
M packages/core/src/components/cv-search/index.js
M packages/core/src/index.js
M storybook/stories/cv-search-story.js

[lee-chase]

The search skeleton is not of the correct form and needs to be switchable between xl and sm. The for and id attributes are not needed.

e.g.

<div class="{{@root.prefix}}--form-item">
  <div role="search" class="{{@root.prefix}}--search {{@root.prefix}}--skeleton {{@root.prefix}}--search--xl ">
    <label for="search-skel" class="{{@root.prefix}}--label"></label>
    <div id="search-skel" type="text" role="search" class="{{@root.prefix}}--search-input"></div>
  </div>
</div>

<div class="{{@root.prefix}}--form-item">
  <div role="search" class="{{@root.prefix}}--search {{@root.prefix}}--skeleton {{@root.prefix}}--search--sm ">
    <label for="search-skel-sm" class="{{@root.prefix}}--label"></label>
    <div id="search-skel-sm" type="text" role="search" class="{{@root.prefix}}--search-input"></div>
  </div>
</div>