* 6641: Implement support for user impersonation: master key clients can log in as any user, without access to the user's credentials, and without presuming the user already has a session
* reworded changelog
* rebuilt package lock
* fit test
* using lodash flatMap
* bump to node 12 for postgres test
* revert test fit
* add node version to postgres CI
* revert package-lock
Co-authored-by: gormanfletcher <git@gormanfletcher.com>
Co-authored-by: Manuel <5673677+mtrezza@users.noreply.github.com>