TCF (0.11.0): Конфигурация пользовательских лейблов метрик Prometheus

[maryiaLichko]

Product: TCF
Since: 0.11.0
Root document: https://www.tarantool.io/en/clustersfederation/doc/latest
SME: @ DifferentialOrange @ themilchenko

Dev ticket: https://jira.vk.team/browse/TNTP-5391

https://jira.vk.team/browse/TNTP-5392
https://gitlab.corp.mail.ru/tarantool/tcf/clusters-federation/-/merge_requests/117