Allow attaching binary file for a field directly when creating a node

While we add a new node with a binary field, it looks like I have to create a new binary node and then refer to it.
This leads me first to create the binary node then I can continue to create my main content node.
e.g. a blog post needs images, but I need to create an image first as a node then I can add it to my blog content.

Start by tracing the node-creation form and the existing binary-field handling in the Angular UI. Compare the current flow, which requires a separate binary node, with the requested direct attachment flow; done means a binary field can be supplied while creating the main node without first creating another node.

Written by the indexing model from the issue text.