[Feature Request] CRUD operations for Data models

As discussed on Slack, it would be interesting to have a way to perform the CRUD operations through Ember Inspector's interface.

My suggestion for the operations:
- Create - a button in the Data panel, it would open in the Object Inspector. Then you'd save it;
- Read - currently you can filter cached records, but not request new ones through the interface, something in the Data would address this;
- Update - this can already be done with the Object Inspector;
- Delete - this could be a conditionally rendered element of the Object Inspector;
- Save - see above.