Add DB_Table.offset for SQLServer

[AdRiley]

Pull Request Description

First implementation of DB_Table.offset for SQLServer.

Added a new SQLExpression.List to enable passing through the group by clauses and order by clauses as a single argument to the offset operation in database.

Currently, because SQLServer doesn't like order bys inside of subqueries there is a less than ideal workaround. We hsould probably revisit the order by logic for in database generally.

Enabled Table.new to specify data types for its columns.

Important Notes

Checklist

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• The documentation has been updated, if necessary.
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• All code follows the
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• Unit tests have been written where possible.
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  or the Snowflake database integration, a run of the Extra Tests has been scheduled.
  • If applicable, it is suggested to paste a link to a successful run of the Extra Tests.

[radeusgd]

Looks great