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Tab Search UI related changes:
- Custom tab-search-item component that represents each tab item
- Show only hostname of tab url on tab-search-item
- Close tab icon for certain list-item states
- Keyboard navigation for tab-search-items

Bug: 1099917
Change-Id: Idae91276a66b5b8e2efd7914266ea73107c58d34
Reviewed-on: https://chrome-internal-review.googlesource.com/c/chrome/browser/resources/tab_search/+/3154044Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Tom Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819570}