Add support for SQL queries

[notV4l]

Is your feature request related to a problem? Please describe. graphql is nice but sql would allow more complex querying

Describe the solution you'd like expose a SQL endpoint with restricted permissions

[mubarak23]

@notV4l kindly assign this issue to me

[mubarak23]

can you also explain the issue further and where the implement will be done in the code

[glihm]

Done in #2714 and previous integration of sql endpoint.