James Vorderbruggen

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This PR adds support for Databricks' timstamp-based [time travel](https://docs.databricks.com/aws/en/delta/history#delta-time-travel-syntax). This is a first step toward resolvign https://github.com/apache/datafusion-sqlparser-rs/issues/2006. The following is now supported: ```sql SELECT 1 FROM t1 TIMESTAMP AS OF...