Move _createNestedObjectRecursive method to Elements repo

Currently the _createNestedObjectRecursive is being used in three different elements:

1. nuxeo-ai-suggestions;
2. nuxeo-dropzone;
3. nuxeo-replace-blob-button;

It is unquestionable that we want to move this piece of code to Elements repository but, given its behaviour, it may not fit any of our current Behaviour Classes.

Given this, it would be interesting to discuss a little bit on how and when it should be done.