In the end, it should be possible to write a single config which is
pushed to the service to steer which emails arrive.
This implements some helper functions and some more endpoints.
We implement Semigroup/Monoid for labelled tuples.
Change-Id: I48bfd311e4a7bba5bc08a9681d823a6a7d5175a8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7727
Reviewed-by: Profpatsch <mail@profpatsch.de>
Autosubmit: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI