Draft: feat: smart client registration, snapshot sending

Georgiy Lomakinrequested to merge
lomakin/topology-change-notifications into master

Summary

  • feat: smart client registration, snapshot sending
  • Close #...
  • Cherry-pick to: none / 25.3 / 25.2
  • Docs follow-up: not necessary / new issue / docs updated in this MR
  • Changelog is updated

Merge request reports