feature/extend admin zone

[lukaskett]

Summary

• added dialog to the list of users that is showed on the user's name click - shows all user's events (the same as competitor's changes in the report)
• added headers with the filters and sort button to the Users and Events tables

Checklist

• I linked the related issue or explained why none is needed.
• I ran the relevant checks for this change.
• I updated documentation or changelog entries when needed.
• By submitting this pull request, I agree to the terms in CLA.md in the
  repository root.