Fix "Create cdc stream" template

[artemmufazalov]

Current template

-- docs: https://ydb.tech/docs/en/yql/reference/syntax/create_changefeed
ADD CHANGEFEED $name WITH (
    MODE = $mode, -- KEYS_ONLY, UPDATES, NEW_IMAGE, OLD_IMAGE, or NEW_AND_OLD_IMAGES
    FORMAT = $format, -- JSON or DEBEZIUM_JSON
    VIRTUAL_TIMESTAMPS = $virtualTimestamps, -- true or false
    RETENTION_PERIOD = $retentionPeriod, -- Interval value, e.g., Interval('PT24H')
    TOPIC_MIN_ACTIVE_PARTITIONS = $topicMinActivePartitions,
    INITIAL_SCAN = $initialScan -- true or false
)

It doesn't work, because it is alter table operation

ALTER TABLE $table ADD CHANGEFEED $name WITH(...)