24-3: Allow streams on index tables, replicate index tables

[CyberROFL]

• Allow streams on index table (Allow streams on index table #6827)
• Allow streams on sync-index table (Allow streams on sync-index table #6842)
• Stream on index table: additional checks & tests (Stream on index table: additional checks & tests #6865)
• Allow to add changefeed to index table via AlterTable (Allow to add changefeed to index table via AlterTable #6883)
• Replicate index tables (Replicate index tables #6937)
• Allow to describe index tables as common tables (Allow to describe index tables as common tables #6954)
• EnableChangefeedsOnIndexTables feature flag (EnableChangefeedsOnIndexTables feature flag #7085)

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