Allow the administrator the view and edit the Hermes queries

[johannesduesing]

Is your feature request related to a problem? Please describe.
As a lot of different code metrics might become important in the future, the administrators of Delphi should be able to view and edit the list of Hermes queries that are executed by the crawlers.

Describe the solution you'd like
A list view should allow the administrators to add / delete / disable queries, which should include not only the jar file implementing the query, but also a description of what the query does. On top of that, it would be nice to have the possibility to apply these new queries to the projects that have already been added to the elasticsearch database in the past.

Describe alternatives you've considered
None

Additional context
This is related to the issue delphi-hub/delphi#5, which is aimed at the user being able to contribute queries. This issue adresses the management aspect for the administrators.