default Path writeFile(String path, Class klass, String resource) {
        return writeFile(Paths.get(path), klass, resource);
    }
Adds a file to the result using the contents of a resource loaded by
calling {@link Class#getResourceAsStream(String)}.

@param path Relative path to the file to create.
@param klass Class to load the resource from.
@param resource Path to the resource to load.
@return Returns the resolved path.
smithy-build/src/main/java/software/amazon/smithy/build/FileManifest.java