* add query builder to facilitate dynamic SQL construction
* leverage query builder to refactor user store
This is partially setup work for MM-13120, but merged to master to avoid
further conflicts.
* fix unrelated unit test breakage
* documentation tweaks
* Apply suggestions from code review
Co-Authored-By: lieut-data <jesse.hallam@gmail.com>
* prefer comma separated case options to fallthrough
* vendor github.com/Masterminds/squirrel and deps
* switch to using github.com/Masterminds/squirrel
* rm querybuilder
