Add resource providers

[jack-berg]

Related to #4701.

Note, if merged as is this will publish with 1.18.0. Perhaps we should wait until 1.19.0?

Also, this artifact was stable in opentelemetry-java but is currently alpha here. We should discuss whether we want to mark it as stable.

[mateuszrzeszutek]

After this PR gets merged (in its current shape), the agent will still depend on the old resource modules, and these new resource providers will not be included in it by default -- and I'm completely fine with that, we can change that in the next PR, I just wanted to state that openly so that we're all on the same page here.

[jack-berg]

After this PR gets merged (in its current shape), the agent will still depend on the old resource modules, and these new resource providers will not be included in it by default

Yes I was planning on doing that in a followup. Happy to do it in this PR to if you prefer.

[trask]

@jack-berg I maybe didn't follow, any reason not to include in 1.18.0?

[jack-berg]

Only reason to hold off might be so there aren't two undeprecated versions of these resource providers published in 1.18.0. I.e. io.opentelemetry:opentelemetry-sdk-extension-resources:1.18.0 and io.opentelemetry.instrumentation:opentelemetry-resources:1.18.0-alpha would both have the same code and both be undeprecated.

I don't feel strongly about this though. Can also merge with a flag that disabled publishing until post release.

[trask]

got it, thx, that makes sense, will hold on this until after 1.18.0 release