[Feature]: Enhancing Cortex.Mediator | Streaming Requests

[eneshoxha]

Support for IAsyncEnumerable responses for large datasets:

public interface IStreamQuery<TResult> { }
public interface IStreamQueryHandler<TQuery, TResult> 
    where TQuery : IStreamQuery<TResult>
{
    IAsyncEnumerable<TResult> Handle(TQuery query, CancellationToken ct);
}