[ONES] Add ONES integration entry and model

Issue link: #1161 (closed)

What does this MR do and why?

• Add feature flag ones_issues_integration
• Add features tag
• Add ONES integration entry (Model)

In order to be more friendly to code review, this MR is restrained in submitting files.

So we can see the word TODO, this part of the feature will be included in the next MRs.

cc JH EM @prajnamas