@Override
        protected Void numberShape(NumberShape shape) {
            generateValueGetter(shape);
            return null;
        }
Generates getter methods for each shape member or the value type held by the trait.

<p>Optional member getters will return the member type wrapped in an {@code Optional<T>}.
smithy-trait-codegen/src/main/java/software/amazon/smithy/traitcodegen/generators/GetterGenerator.java