Add AskQL support

[pkarw]

What is the motivation for adding/enhancing this feature?

AskQL: I guess it could be the next big thing. The GraphQL successor. With Ask one can send not only the query but the querying program itself - applying some business logic before getting back results. Saving a lot of subsequent network calls, bandwidth, and computing power. It’s Open-Source (MIT).

https://askql.org/press-release.html
https://github.com/xFAANG/askql

What are the acceptance criteria

• add a way to expose the AskQL endpoint exactly the same way as GraphQL