sql: add json{,b}_populate_record{,set}

[cockroach-teamcity]

Exalate commented:

cockroachdb/cockroach#70115 --- Release note (sql change): add the json_populate_record, jsonb_populate_record functions, json_populate_recordset, and jsonb_populate_recordset functions, which transform JSON into row tuples based on the labels in a record type.

Jira Issue: DOC-725

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