Log HTTPs cert info on startup

Kestrel logs endpoint when the server starts, but doesn't log which certificates were used. Now that Kestrel endpoints and certs can be configured from a file https://github.com/aspnet/KestrelHttpServer/pull/2186, it would be nice to show console info to help users identify if their config was correctly used.

Some ideas:

From store, show friendly name

Now listening on: https://localhost:5001
Using server certificate: "ASP.NET Core HTTPS development certificate" from cert:\CurrentUser\My

From store, show subject

Now listening on: https://localhost:5001
Using server certificate: CN=localhost, cert:\CurrentUser\My

From store, include more info like thumbprint

Now listening on: https://localhost:5001
Using server certificate: CN=localhost, cert:\CurrentUser\My, 52A477BBEDE8DFDEB699106D5FFB8FE89F9BF790

From file

Now listening on: https://localhost:5001
Using server certificate: C:\dev\test\cert.pfx

Multiple certs

Now listening on: https://localhost:5002
Using server certificate: C:\dev\test\cert2.pfx
Now listening on: https://localhost:5001
Using server certificate: C:\dev\test\cert1.pfx