Way to get access to the underlying JsonNode for external connector implementation

As an example, Commercetools provides their own way and utilities to map a com.fasterxml.jackson.databind.JsonNode to their built-in POJOs:

• https://commercetools.github.io/commercetools-jvm-sdk/apidocs/io/sphere/sdk/json/SphereJsonUtils.html

So, developers need to use SphereJsonUtils#readObject(com.fasterxml.jackson.databind.JsonNode jsonNode, ..) instead of using CRISP's ResourceBeanMapper. If you use the latter, it throws an exception because their built-in beans do not comply fully with Jackson annotations or bean creations.

Therefore, it would be nice if we do the following:

• Add Object org.onehippo.cms7.crisp.api.resource.Resource#getNodeData() in CRISP API;
• So, after invoking #findResources(...) or #resolve(...) through CRISP, they can invoke the method and cast to com.fasterxml.jackson.databind.JsonNode by themselves;
• And then they may use SphereJsonUtils#readObject(com.fasterxml.jackson.databind.JsonNode jsonNode, ..)