Show all resource endpoints on resource grid

[JamesNK]

Fixes #1489

• Displays a merged list of endpoints/services in the dashboard grid
• Only includes endpoint proxy URL. The underlying endpoint URL is still available in the details view.

The implementaiton is messy because:

• The data is split between endpoint and service collections on a resource.
• There is duplicate data between the two collections (endpoints appear to always have a service) and we don't want to display both
• There isn't a good way to match endpoints to a service. Forced to parse endpoint URL to a Uri and match with host/port.
• Services are immediately available while endpoints load in as they become available.

I think the model around endpoints and services returned from the resource service needs to be improved. At the very least, endpoints should have their service name to make matching them together easier.

Demo:

[davidfowl]

I think the model around endpoints and services returned from the resource service needs to be improved. At the very least, endpoints should have their service name to make matching them together easier.

I'm filing an issue with protocol changes. I think we want to make it a bit more abstract as well (to support custom resources).

[joperezr]

Friendly reminder that this PR is assigned to the Preview 4 milestone which is snapping in a couple of hours. Please ensure it is merged by 4pm PST in order to ensure the change will be part of Preview 4.