[Subtask][#3039] Add operation resource REST docs

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

### Search before asking

- [X] I have searched in the [issues](https://github.com/apache/incubator-kyuubi/issues) and found no similar issues.

### Describe the subtask

Add operation resource REST docs

### Parent issue

https://github.com/apache/incubator-kyuubi/issues/3039

### Are you willing to submit PR?

- [X] Yes. I can submit a PR independently to improve.
- [ ] Yes. I would be willing to submit a PR with guidance from the Kyuubi community to improve.
- [ ] No. I cannot submit a PR at this time.

Read parent issue #3039 first to determine the operation resource REST documentation scope and where it belongs. Add the requested operation resource REST docs, with completion shown by the relevant documentation being present and consistent with the parent issue.

Written by the indexing model from the issue text.