Row-level TTL support; Engine specification, settings and migrations #203
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This PR offers support for ClickHouse's row-level TTLs introduced in ClickHouse v19.6.0: https://clickhouse.com/docs/en/guides/developer/ttl/
It also exposes two settings to
MergeTreeengine specification:storage_policy: https://clickhouse.com/docs/en/engines/table-engines/mergetree-family/mergetree#storage_policymerge_with_ttl_timeout: https://clickhouse.com/docs/en/engines/table-engines/mergetree-family/mergetree#merge_with_ttl_timeoutIt includes a new migration
ModifyTTL()which uses anALTER TABLEquery to change row-level TTLs for existing tables.