Enable SessionAuthentication on APIv3 endpoints

[humitos]

This is required to be able to use the APIv3 from the dashboard in the new templates we are creating.

@agjohnson is this enough for the work you need at the moment?

I'm not documenting this yet so we start using it internally, but after that we should change the documentation a little.

[agjohnson]

Yeah, i assumed this was the only piece we needed. You can test by simply making a call from the debug console to the API v3 endpoint. It should give you a valid response. That is all I would need to make a client request to APIv3 for dashboard interactions

[humitos]

I tested this with the Browseable API by being logged in. However, I followed your example as well and it worked.

Not logged in,

After logging in,