FR: Add support for binary payload in repo_node module

[teklabania]

Currently repo_node supports only text as properties values:

    - name: save some node
      wttech.aem.repo_node:
        command: save
        instance_id: local_author
        path: /content/foo
        props:
          foo: text1
          bar: text2

Please add support for binary values for properties. Example usage hmac and master keys for AEM crypto.