public static int computeEnumSize(final int fieldNumber, final int value)
    {
        return computeTagSize(fieldNumber) + computeEnumSizeNoTag(value);
    }
Compute the number of bytes that would be needed to encode an enum field, including tag. Caller is responsible
for converting the enum value to its numeric value.
protostuff-core/src/test/java/io/protostuff/CodedOutput.java