.Net Bug: Filters ignored when `IChatClient` is used by `Kernel`

[crickman]

Describe the bug
AI services based on IChatClient does not invoke filters.

To Reproduce
Steps to reproduce the behavior:

IChatClient chatClient = ...; // However one creates a chat client

IKernelBuilder builder = Kernel.CreateBuilder();
builder.Services.AddSingleton(functionCallingChatClient);
Kernel kernel = builder.Build();

kernel.Plugins.AddFromType<MyPlugin>(); // Any plugin
kernel.FunctionInvocationFilters.Add(new MyFunctionFilter());

kernel.InvokePromptAsync(
    "<some message that triggers function invocation>", 
    new KernelArguments(new PromptExecutionSettings() { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() });

private sealed class MyFunctionFilter : IFunctionInvocationFilter
{
    public async Task OnFunctionInvocationAsync(FunctionInvocationContext context, Func<FunctionInvocationContext, Task> next)
    {
        System.Console.WriteLine($"INVOKING: {context.Function.Name}");
        await next.Invoke(context);
        System.Console.WriteLine($"RESULT: {context.Result}");
    }
}

Expected behavior
Filter invoked as part of function invocation.

Platform

• Language: C#
• Source: main

Additional context
Transition to support MEAI IChatClient should be seamless. Instead, there is a silent failure for an existing application or service that is using filters. This is not at parity for SK developers and has poor discoverability (unable to realize what doesn't work ahead of time).

NOTE: Certain of our AI connectors primarily rely on IChatClient (i.e. Ollama).

[rogerbarreto]

For invocation to be used with Kernel:

• Use the Add<Provider>ChatClient extension methods in IServiceCollection or KernelBuilder.
  OR
• Add kernel invocation capability to your already existing IChatClient using the Builder pattern:
  i.e: myChatClient().AsBuilder().UseKernelFunctionInvocation().Build()

[crickman]

I've done the second since I'm using the logic you implemented in the samples. When useChatClient is false, the filter is invoked. When true, it is not.