* WIP: PromQL: Allow engine to return strings
Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Add test suggested by @roidelapluie
Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Fix typo in React UI
Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Fix parenthesis handling for functions and aggregator params
Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Add more tests
Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>

* Fix React UI test
Signed-off-by: Tobias Guggenmos <tguggenm@redhat.com>