Override ToString for endpoint metadata

[Kahbazi]

Contributes to #34604

[SteveSandersonMS]

Question for the ASP.NET Core engineers: to what extent do you think the exact behavior of ToString should be considered supported and preserved for back-compat? Is there a risk that, in supplying this kind of info from ToString, we preclude ourselves from changing more things in the future (or possibly even just adding more info) because people might take a dependency on these exact string formats?

I know most of our types don't format and return internal state info from ToString, as we'd normally use DebuggerDisplay or similar for that.

[JamesNK]

I agree that DebuggerDisplay is the best place to add friendly text for debugging. The difference here is we need to capture the value at runtime.

The alternative, at least in this case, is adding an IEndpointDebugText like interface with a DebugText property and implementing it on all these types. I'm fine with using ToString here.

[BrennanConroy]

Triage: Closing as the issue has been backlogged and needs some design, thank you for helping 😃