Feat: improving multiselect dropdown

[f-necas]

Search input in multiselect dropdown is improved by :

• Removing outlin when input is focused
• Focusing directly this input
• Handle arrow keyboard inputs between input and checkboxes

[github-actions]

Affected libs: feature-search, feature-record, feature-router, feature-map, feature-dataviz, ui-inputs, feature-editor, ui-elements, feature-catalog, ui-catalog, ui-search,
Affected apps: metadata-editor, datahub, demo, webcomponents, search, map-viewer, metadata-converter, datafeeder,

• 🚀 Build and deploy storybook and demo on GitHub Pages
• 📦 Build and push affected docker images

[github-actions]

GitHub Pages links:

🚧 building in progress... 🚧

[jahow]

I think this looks very good, thanks!

Using a focus trap might be too radical for the search input since then the tab key no longer allows us to navigate through the options. I guess we could introduce our own gnUiAutofocus directive to do that? See this article for example https://davidmcintosh.medium.com/auto-focusing-an-angular-input-the-easy-way-part-2-directives-ac9dc9a7ec73

Or: https://netbasal.com/autofocus-that-works-anytime-in-angular-apps-68cb89a3f057

(there might be other libraries for that as well)

[f-necas]

Thanks @jahow for your review. I've updated the code in order to keep keyboard accessibility working.

Outline is also set to the full search div.