[receiver/k8sobjects] initial commit

[hvaghani221]

Description:
Adding a receiver to collect(pull/watch) Kubernetes Objects

Link to tracking Issue:
#14185

Testing:
Added unit tests with mocked dynamic client and discovery client

Documentation:

[dmitryax]

Just one nit. Otherwise LGTM

[hvaghani221]

According to current logic, it will dynamically find GroupVersion for the given resource, but it is possible that other Groups also have resources with the same name. It will create a conflict. For example, both v1 and events.k8s.io/v1 have events resource.

I need to add an API Group config to specify the group in case of a conflict.

[dmitryax]

what Kubernetes version are you using?

I use v1.24.3 on GKE with the same config but auth_type: serviceAccount

[hvaghani221]

@dmitryax for events, it is using the events.k8s.io group. So, you need to add it in the ClusterRole.

Maybe we can handle this error better.

[hvaghani221]

@dmitryax is there any pending action item for me?

[dmitryax]

Thanks for implementing it. It's good as an initial version. Any further work can be done separately

[mx-psi]

It looks like this PR broke tests on main, even if it passed here. I opened #15663 to revert it; unless the solution is quick I think we should revert so that we can proceed with today's release