Update search term parsing in web-toolkit

Currently the web-toolkit splits search terms as "AND" first, then "OR". However because "AND" takes precedence over "OR" in Boolean searching, the order should be reversed. That is to say currently

A AND B OR C -> A AND (B OR C)

but it should be

A AND B OR C -> (A AND B) OR C

This will allow us to implement this story for date searching more simply on the front end because we can pass

startDate > 2020-01-01 AND startDate < 2020-12-31 OR startDate notSet

and get the expected result of
All Licenses with a startDate in 2020 plus all licenses with no startDate set