Add syntax level BEFORE keyword support for time travel

[gupteaj]

Presto has added time travel feature for iceberg tables to allow point-in-time query using AS OF syntax.
This feature request will allow presto to query table state before a specific snapshot id or timestamp.

Presto issue for time travel feature - #20495

Expected Behavior or Use Case

// Return table data for tab1 before snapshot id 8772871542276440693
select * from tab1 FOR SYSTEM_VERSION BEFORE 8772871542276440693;

// Return table data for tab1 before '2023-08-17 13:29:46.822 America/Los_Angeles'
select * from tab1 FOR SYSTEM_TIME BEFORE TIMESTAMP '2023-08-17 13:29:46.822 America/Los_Angeles';

Context

Snowflake provides a BEFORE clause for time travel queries. When used in a query, this clause is specified in the FROM clause immediately after the table name. It determines the point in the past from which historical data is requested for the object. The AT keyword includes changes made by a statement or transaction with a timestamp equal to the specified parameter, while the BEFORE keyword refers to a point immediately preceding the specified parameter.

IBM Netezza supports BEFORE clause similar to Snowflake.

References -
Snowflake - https://docs.snowflake.com/en/sql-reference/constructs/at-before
IBM Netezza - https://cloud.ibm.com/docs/netezza?topic=netezza-runningqueries_tt#before_tt

[gupteaj]

PR for BEFORE syntax engine side changes - #22631

[gupteaj]

Connector changes PR : #22851