Final Kotlin conversion of QueryTask

Built successfully against Kotlin 1.7 and with -Werror turned on.

Bug: 239665416

Test: manual testing with bramble device, unit tests ran with atest QuickSearchBoxTests with result:
Summary (Test executed with 1 devices.)
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arm64-v8a QuickSearchBoxTests: Passed: 50, Failed: 0, Ignored: 0, Assumption Failed: 0,

All tests passed!

Change-Id: Ia0f715bc91ffd54f67f1d2da78e9f5916720efee