Using a different image for Aspire CosmosDB emulator

Readme.txt

The RunAsEmulator function mostly serves as a wrapper around adding the container image and port with a specific "emulator" name
so it can be replaced by that call and whatever emulator is being used.

It'll be important to run `docker pull` on the image you use, and also I needed to run `dotnet dev-certs https --trust`

Program.cs

var builder = DistributedApplication.CreateBuilder(args);

var database = builder.AddAzureCosmosDB("cosmos").AddDatabase("iotdb")
                      //.RunAsEmulator()
                      .WithEndpoint(name: "emulator", targetPort: 8080)
                      .WithAnnotation(new ContainerImageAnnotation
                      {
                          Registry = "<registry name>",
                          Image = "<image name>",
                          Tag = "<tag>"
                      });

var apiService = builder.AddProject<Projects.AspireWithCosmos_ApiService>("apiservice")
    .WithReference(database);

builder.AddProject<Projects.AspireWithCosmos_Web>("webfrontend")
    .WithExternalHttpEndpoints()
    .WithReference(apiService);

builder.Build().Run();