Backend service for reports

[TheSlimvReal]

Add a backend service (or extends the permission backend) with an endpoint that allows to query data.
This endpoint receives the name of the organization and the ID of the report.
The report than uses the access token of the request to request the report entity with the given ID (user needs read access on the report entity).
The service then executes the query of the report on the database and returns the result as JSON.