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Fixes #85
Changes in this branch work around a memory leak caused by Oracle JDBC bug 34545179.
The workaround is to call getMoreResults(CLOSE_ALL_RESULTS) before closing the JDBC statement. This call has Oracle JDBC remove all elements from the ArrayDeque used internally to store ResultSet objects.
I don't have an automated test for this as it would require a way to WeakReference the ResultSet and verify that it gets garbage collected. Oracle R2DBC does not expose the ResultSet object to user code, so I can't access that with test code.
I've verified this by setting a debug breakpoint that triggers on the condition of Oracle JDBC's ArrayDeque not being empty when the statement is closed. I was able to run the full test suite without triggering this breakpoint, so I am confident that this fix will work.