refactor(davinci-client): introduce RichTextCollector to avoid breaking ReadOnlyCollector

ReadOnlyCollector now represents plain-text LABEL fields only.
RichTextCollector is a new dedicated type for LABEL fields with
richContent, so consumers can discriminate on collector.type without
a breaking change to the existing ReadOnlyCollector output shape.

Author: ryanbas21

e2e/davinci-app/components/label.ts

@@ -4,9 +4,9 @@
  * This software may be modified and distributed under the terms
  * of the MIT license. See the LICENSE file for details.
  */
-import type { ReadOnlyCollector } from '@forgerock/davinci-client/types';
+import type { RichTextCollector } from '@forgerock/davinci-client/types';
 
-export default function (formEl: HTMLFormElement, collector: ReadOnlyCollector) {
+export default function (formEl: HTMLFormElement, collector: RichTextCollector) {
   const p = document.createElement('p');
   p.style.whiteSpace = 'pre-line';
   const { richContent } = collector.output;