Custom filters

Is your feature request related to a problem? Please describe.

Cancellation token is throwing error which can be handled graceful way like described here

https://andrewlock.net/using-cancellationtokens-in-asp-net-core-mvc-controllers/

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc(options =>
        {
            options.Filters.Add<OperationCancelledExceptionFilter>();
        });
    }
}

Describe the solution you'd like

It would be nice to add custom filter

builder.Services.AddMcpServer(options =>
        {
            options.Filters.Add<OperationCancelledExceptionFilter>();
        })

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

Start by reviewing the AddMcpServer options entry point and how cancellation exceptions are currently handled in the server pipeline. Define how a custom OperationCancelledExceptionFilter can be registered there and verify that cancellation is handled gracefully without producing the current error.