Implement UI improvements to the Search page

Develop the UI improvements discussed in XWIKI-21912 and proposed on the design page https://design.xwiki.org/xwiki/bin/view/Proposal/UXImprovementsforsearchresults

• Sorting accessed through a dropdown with categories visually separated
• Sorting and view options on the same line
• View options are now using a standard checkbox as its component
• Filter bar categories with visual separation
• Filter bar counting component visually distinguished from regular text