Add support for Timestamp data type in SQL Select (#7185)

This change adds support for casting strings to Timestamp via CAST:
`CAST('2010T' AS TIMESTAMP)`

It also implements the following date-time functions:
  - UTCNOW()
  - DATE_ADD()
  - DATE_DIFF()
  - EXTRACT()

For values passed to these functions, date-types are automatically
inferred.

pkg/s3select/sql/statement.go

@@ -84,7 +84,6 @@ func ParseSelectStatement(s string) (stmt SelectStatement, err error) {
 	stmt.selectQProp = selectAST.Expression.analyze(&selectAST)
 	err = stmt.selectQProp.err
 	if err != nil {
-		fmt.Println("Got Analysis err:", err)
 		err = errQueryAnalysisFailure(err)
 	}
 	return