private void writeBuilderMethod() {
        writer.openBlock("public static Builder builder() {",
                "}",
                () -> writer.write("return new Builder();")).newLine();
    }
Generates a static builder for a Java class.

<p>In addition to the static builder class, this generator will create
{@code builder()} and {@code toBuilder()} methods for the target class.
smithy-trait-codegen/src/main/java/software/amazon/smithy/traitcodegen/generators/BuilderGenerator.java