fix(codegen): strip names from enums

[JordonPhillips]

Description of changes:

This adds an integration to strip names from enums that GA'd without them in order to preserve backwards compatibility.

I also took the liberty of updating your checkstyle so that more recent copyright years can be used.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[alexforsyth]

QQ: How is this generated?

[JordonPhillips]

Path baseDir = Paths.get(getClass().getResource("services").toURI());
Set<Pair<StringShape, EnumTrait>> hasNames = new HashSet<>();
Set<Pair<StringShape, EnumTrait>> noNames = new HashSet<>();
for (Path path : Files.list(baseDir).collect(Collectors.toSet())) {
    Model model = Model.assembler()
            .discoverModels()
            .addImport(path)
            .assemble()
            .unwrap();
    model.shapes(StringShape.class)
            .flatMap(s -> Trait.flatMapStream(s, EnumTrait.class))
            .forEach(pair -> {
                if (pair.getRight().getValues().get(0).getName().isPresent()) {
                    hasNames.add(pair);
                } else {
                    noNames.add(pair);
                }
            });
}

List<String> shapes = noNames.stream()
        .map(pair -> pair.getKey().getId().toString())
        .sorted()
        .collect(Collectors.toList());

Path output = Paths.get("/tmp/enums-sans-names.json");
Files.write(output, Node.prettyPrintJson(Node.fromStrings(shapes)).getBytes());

[alexforsyth]

Sweet! Thanks so much for doing this. LGTM +1

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