Add SQL Reference doc page for dedup unique ID feature for insert batches

[e-mars]

based on release 22.2.X
https://clickhouse.com/docs/en/whats-new/changelog/#:~:text=Add%20a%20setting,Igor%20Nikonov

[DanRoscigno]

Add a setting that allows a user to provide own deduplication semantic in MergeTree/ReplicatedMergeTree If provided, it's used instead of data digest to generate block ID. So, for example, by providing a unique value for the setting in each INSERT statement, the user can avoid the same inserted data being deduplicated. This closes: #7461. #32304 (Igor Nikonov).

[DanRoscigno]

closed by https://clickhouse.com/docs/en/operations/settings/settings/#insert_deduplication_token