Renamed from query-service-deployment to simply query-service. Added
resource limits and requests to both deployment and integration pod.
Added horizontal pod autoscaler to scale up query service based on cpu
usage.

If there is an error retrieving the database info an error is now
returned.

Updated integration testing config and CI/CD config

See merge request datastrophe/microservices-backbone/query-service!17

Database credentials are retrieved from the user service

See merge request datastrophe/microservices-backbone/query-service!16

Most of this code was taken straight from the schema service. No tests
were written because this is entirely dependent on external
dependencies.

The request function now requires database credentials instead of using
hardcoded values.

286 unit testing

See merge request datastrophe/microservices-backbone/query-service!14

Moved publishmessage method into separate file.

ie changing names of interfaces and moving structs to other files. Also
gitignore updated to ignore the 'make coverage' outputs.

An error message now gets published if there is an error while
converting the query or there is a database error.

Mainly testing the handlemessage method with different input messages.

Implements the ConvertQuery method and just returns a hardcoded string
value.

Mock producer can now be made. Producer can publish messages. Messages
can be retrieved from the mock broker.

Also changed around some of the naming.

Merge branch 'develop' of git.science.uu.nl:datastrophe/microservices-backbone/query-service into develop