Update Java DuckDBAppender to allow appending null values - fixes issue 3035 #3039
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Updates Java DuckDBAppender to allow appending null values. The version of the append method that takes a java.lang.String now properly handles being passed null by invoking the corresponding version of the C++ Appender class to append a null value, regardless of column type.
Includes additional unit tests to verify that null values can now be appended in integer and varchar columns.
Closes #3035.