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The Materialize-specific runner for sqllogictest.

slt tests expect a serialized execution of sql statements and queries. To get the same results in materialize we track current_timestamp and increment it whenever we execute a statement.

The high-level workflow is: for each record in the test file: if record is a sql statement: run sql in postgres, observe changes and copy them to materialize using LocalInput::Updates(..) advance current_timestamp promise to never send updates for times < current_timestamp using LocalInput::Watermark(..) compare to expected results if wrong, bail out and stop processing this file if record is a sql query: peek query at current_timestamp compare to expected results if wrong, record the error

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