Dapr should work in http instead of https

[xky0007]

Describe the bug

In the source code internal sealed class Dapr : ConfigureOptionBase<DaprOptions>

 // Permit the port to be set if provided, otherwise use defaults.
 if (properties.TryGetValue(GrpcPortKey, out var value) &&
     int.TryParse(value, CultureInfo.InvariantCulture, out var port))
 {
     options.GrpcEndpoint = "https://localhost:" + port;
 }

 if (properties.TryGetValue(HttpPortKey, out value) &&
     int.TryParse(value, CultureInfo.InvariantCulture, out port))
 {
     options.HttpEndpoint = "https://localhost:" + port;
 }

From the dapr API doc, it should use http instead of https. And after I changed https to http, #2109 is also solved. (Also need to change to GRPC protocol #2118 )

Thanks.

[marcschier]

Many thanks for the contributions, more are certainly welcome in this area in particular. I added a "Scheme" key to the connection string to select http or https, the default is now "http". preview4 container image will be available later today. Keep it coming :-)