Support for predefined consumers of CDC topics

[Eistern]

In this PR, we are adding an option to specify a list of consumers that will be created alongside the CDC topic during the initial bootstrap of the application.

A minor consideration is that TopicService/AlterTopic is not idempotent and will throw an exception if we specify already existing consumers in the addConsumer block. To address this behavior, we will perform a describe operation each time a table is attempted to be created.

These changes have been tested against local YDB (ydbplatform/local-ydb:latest version).

[Eistern]

This update replicates terraform resource behavior (https://ydb.tech/docs/en/dev/terraform#ydb-table-changefeed) and allows the user to implement non-trivial CDC reading logic without worrying about creation of the consumers