Support JavaDoc comment to an annotation element

[gastaldi]

Discussed in #270

^{Originally posted by rob-stoecklein November 8, 2022}
When creating an annotation type, how do we set the JavaDoc for an element?
In the example below, it's the JAVADOC TEXT.

    /**
     * Trying to build the following annotation:
     * 
     * public @interface MyAnnotation {
     *
     *     /**
     *      * JAVADOC TEXT
     *      */
     *     String element;
     * }
     */
    public static void main(final String[] args) {
        final JavaAnnotationSource output = Roaster.create(JavaAnnotationSource.class);
        output.setName("MyAnnotation");

        final AnnotationElementSource annotationElementSource = output.addAnnotationElement();
        annotationElementSource.setName("element");
        annotationElementSource.setType("String");
        //annotationElementSource.getJavaDoc().setFullText("JAVADOC TEXT");  // <== Expecting a call like this

        final String outputStr = Roaster.format(output.toString());
        System.out.println(outputStr);
    }

How can we get this to work?
Thanks!