TCF (0.11.0): Секции `storage` и `storage_params` для Gateway

[maryiaLichko]

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

Описать новые секции в справочнике
https://jira.vk.team/browse/TNTP-4595