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A node with this commit, when creating a new CDC generation (during bootstrap, upgrade, or when running checkAndRepairCdcStreams command) will check for the CDC_GENERATIONS_V2 feature and: - If the feature is enabled create the generation in the v2 format and insert it into the new internal table. This is safe because a node joins the feature only if it understands the new format. - Otherwise create it in the v1 format, limiting its size as before, and insert it into the old table. The second case should only happen if we perform bootstrap or run checkAndRepairCdcStreams in the middle of an upgrade procedure. On fully upgraded clusters the feature shall be enabled, causing all new generations to use the new format.