New issue/merge request filters

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There are a couple of issue and merge request filters, GitLab might benefit from:

• Number of reviewers (sometimes, you only want to review merge requests with a non-sufficient amount of reviewers set yet)
• Search scoped labels by prefix only (maybe per wildcard, but offering a way to do this via UI additionally would probably not bad either)
• Add a new type of labels ("progressive labels") that can be filtered with > and <. This would require a settings interface where they can be ordered within their respective group
• Other existing filters might also benefit from this filter operator:
  • Iteration
  • Release
• Reviewed by–unlike "Reviewer", this would not (only) look for merge requests where the person was explicitly requested to review (and therefore, is in the reviewer list) but also those, where they voluntarily reviewed (so, they additionally plop up in the list of approvers or, if they haven't approved, in the comments with change requests)
• Commenter: When someone has commented but not (necessarily) reviewed
• Whether a merge request is draft or ready (this might alternatively implemented as a tab, though, probably not as helpful as the "merged" and "closed" ones)
• Approvals: Like "number of reviews", also with the </> filter
• Reviews: Like "Approvals", but the total number of all reviews, regardless of whether they were an Approval, also with the </> filter