Limit number of results
Allows actions to be executed on a limited subset of resources.
As noted in the discussion, the names of some of the classes will be changed (in !49 (merged)). This MR adds a new Limiter
class assuming that !49 (merged) will be merged too (and then after that all the names will be consistent)
Closes https://gitlab.com/gitlab-org/gitlab-triage/issues/58
Edited by Mark Fletcher