Do not fold empty table join for Right Outer and Full Outer Joins

During [`buildJoin`](https://github.com/dolthub/go-mysql-server/blob/d9c710c32e81425cd9b1e1812a9e8ef751af326b/sql/planbuilder/factory.go#L150), we return an empty table if either side of the join is empty. We don't do this for Left Outer joins with an empty right side, but we also shouldn't do this for Full Outer joins or Right Outer joins with an empty left side.

To avoid checking both left and side sides, we should transpose the tables before checking if the tables are empty.

TODO added in dolthub/go-mysql-server#3419