Omit compiler-generated methods from record classes in source generator

[arthurward]

When the source generator runs on a record class, it includes all of the compiler-generated methods. This clutters up the diagram, especially since the type is already annotated with the record stereotype. For me, the resulting diagrams are more useful if those methods are omitted, leaving only the properties that were actually defined in the source code.

For comparison, the tool implementation already omits the extra methods.