Option to automatically create a token when content is created

Problem/Motivation

It's hard to find how to access the URLs, a person has to save the content then go back to edit the content again, open the "Temporary unpublished access" fieldset, create a token and then copy the URL.

Proposed resolution

Provide an option to automatically create a new token when content is first created, and then post a link to it as a message on the page.

Remaining tasks

Build the changes.

User interface changes

An option would be available to automatically create a token when content is first created.
If the option is enabled for a specific entity bundle, when such content is first created a token would be created and then a message would be displayed with a link to the unpublished content,

API changes

TBD

Data model changes

TBD