Add GraphQL Java Instrumentation

[jord1e]

Is your feature request related to a problem? Please describe.
GraphQL Java is an essential library for building GraphQL API’s in Java and Kotlin (and other JVM languages, of course).

It powers the following projects:

• Spring GraphQL (experimental)
• DGS framework by Netflix
• graphql-kotlin by Expedia

The library needs proper observability.

Describe the solution you'd like
Javaagent and native instrumentation added to OpenTelemetry.
Instrumentation is already present for JavaScript and Ruby, go instrumentation has been proposed

Considering the fact that no semantic conventions have yet to be adopted, I propose we reuse the span names/events used by the NodeJS OpenTelemetry instrumentation.

Describe alternatives you've considered
N/A

Additional context
I would be prepared to create a pull request to add javaagent instrumentation, please let me know if this is acceptable.
This will probably take some time. I expect to have time beginning next month.
Considering that java-instrumentation-contrib guidelines aren’t yet clear I will create the PR in this repository.

[anuraaga]

Thanks @jord1e - this seems like important instrumentation and I think this repo is appropriate. A PR would be greatly appreciated - but please start with what we call library instrumentation which would implement that Instrumentation hook. Especially when the library provides the hook, we prioritize using it, since javaagent then just auto-registers the library instrumentation. Would that be ok for you?

[jord1e]

I will look into it somewhere this week or next week and come back with a formal proposal.
The new instrumentation label is probably appropriate for this issue, right?