Include summary of unsupported features

### Description

We should add a "Comment" node into the flow which details any properties/features that are not supported yet in D2.0

We could have a `comments` class/instance passed to each Transformer. Then a function on that class that provides ability to `comments.add` with a requirement to pass in `node` and the specific `comment`

Aftwr paesing all nodes, we should loop iver the detailed comments, and should then construct a multiline report in the comment node for which properties are not supported, ensuring we clearly label the relevant nodes (by name, ID, label where appropriate)

### Requested By

- Customer name and/or link to HubSpot contact