[Proposal] Let AddSiloBuilderConfigurator has an overload which accept an Action to configure cluster

[zeinali-ali]

Hi
Currently creating a configure class and calling AddSiloBuilderConfigurator<T>() or AddClientBuilderConfigurator<T>() is the only way to configure TestClusterBuilder.

There are cases in which each test may want to just replace a service isolated just for itself, currently we have to create a class for each test which need to setup a fake service:

internal class Test1Configurations : ISiloConfigurator 
{
    internal static MyFakeService fakeService = new();
    void ISiloConfigurator.Configure(ISiloBuilder siloBuilder)
    {
        siloBuilder.Services.AddSingleton<IMyService>(fakeService);
    }
}
[Fact]
public async Task Test1()
{
    _builder.AddSiloBuilderConfigurator<Test1Configurations >();
    var cluster = _builder.Build();
    cluster.Deploy();
    Test1Configurations.fakeService.SetData("test data");
}

It would be so useful if AddSiloBuilderConfigurator and AddClientBuilderConfigurator have an overload like this
void AddSiloBuilderConfigurator(Action<ISiloBuilder> configAction)
the usage would be like this:

[Fact]
public async Task Test1()
{
    var myFakeService = new MyFakeService();
    _builder.AddSiloBuilderConfigurator(siloBuilder =>
    {
        siloBuilder.Services.AddSingleton<IMyService>(myFakeService);
    });
    var cluster = _builder.Build();
    cluster.Deploy();
    myFakeService.SetData("test data");
}

I can prepare a pull request if you agree on this proposal.