Move opentelemetry_absinthe to instrumentation

[cpiemontese]

This PR moves the code for opentelemetry_absinthe under the instrumentation folder

[cpiemontese]

I also took the opportunity to update CODEOWNERS for both this and opentelemetry_httpoison.

Bonus question: I added absinthe as an option for the release dispatch workflow, who can publish these versions though...?

[GregMefford]

@bryannaegele @tsloughter What are your thoughts about getting this merged? Are we just waiting on a more thorough review, or is there more to it than that? I can probably find some time to do that review soonish.

[yordis]

@tsloughter I just noticed that the fork we have isn't under the org; do you think we could get this in? I would like to make it up to date with SemConv and so on

[perzanko]

@yordis @cpiemontese What's the status on this?

[tsloughter]

@yordis so you want this one merged? Have you reviewed and compared to your fork?

[yordis]

@tsloughter I would probably merge this one first, and then I follow up on whatever works needs to be done

[tsloughter]

Ok. Then the conflict just has to be resolved.

[yordis]

@cpiemontese are you able to fix the merge conflict or would like me to do it?

[cpiemontese]

Done ✅

[yordis]

We need to follow on up this one since we should have nimbleoptions, semconv 27+ and so on.

But we can do that in a follow up PRs instead.