Improve label search to include AND, OR, NOT, and ONLY search syntax

Issue Summary

• When searching for content by labels, we can only add labels into the search box on the side which defaults to an "OR search".
• We're unable to exclude content with other labels, and to return content with only the label we're looking for.

Current behavior

1. Create a page and add the label "test1"
2. Create another page and add the label "test1", and "test2".
3. Search for "test1" in the advanced search page.
   • https://<SITENAME>.atlassian.net/wiki/search/?text=&labels=test1
4. It will return both the first and second page, as the "test1" label is found in both pages.

Suggested behavior

• Improve the label search for better granularity.
  1. AND, OR, NOT
  2. ONLY
     • Exclude content that has other labels than the one specified.