Add support for avif format. (#300)

Add support for parsing rich text from JSON.

Author: rafalniski

src/main/java/com/contentful/java/cda/image/ImageOption.java

@@ -34,7 +34,12 @@ public enum Format {
     /**
      * Use googles lossy and lossless format.
      */
-    webp;
+    webp,
+
+    /**
+     * Use the AVIF format, which is efficient for compression and quality.
+     */
+    avif;
 
     final String override;
 

src/main/java/com/contentful/java/cda/rich/RichTextFactory.java

@@ -143,7 +143,7 @@ static List<CDARichMark> resolveMarks(List<Map<String, Object>> rawMarks) {
      * @param rawNode the map response from Contentful
      * @return a CDARichNode from this SDK.
      */
-    static CDARichNode resolveRichNode(Map<String, Object> rawNode) {
+    public static CDARichNode resolveRichNode(Map<String, Object> rawNode) {
         final String type = (String) rawNode.get("nodeType");
         if (RESOLVER_MAP.containsKey(type)) {
             return RESOLVER_MAP.get(type).resolve(rawNode);