.NET: Add support for Subworkflows and many threading fixes (#1066)

* feat: Add support for Workflow-as-Executor

* Fixes routing of 'object' compile-typed variables to properly take in type information
* Fixes a concurrency issue in StepTracer

* fix: Make Subworkflow ExternalRequests work properly

* fix: Threading and Concurrency fixes; prep for OffThread Mode

* refactor: Remove dead code around OffStreamRunEventStream

Currently not used, and will be replaced with a rewrite when brought back, so having it in the change is not valuable.

* ci: Work around issues with dotnet-format not properly analyzing the source

* fix: Fix the logic of AsyncCoordinator and AsyncBarrier

* Prevent individual wait cancellations from canceling the entire barrier
* Propagate information about whether the wait was completed or cancelled, and whether any waiters were present when released

* fix: Remove superfluous acces to .Keys in InProcStepTracer

* refactor: Clean up AsyncCoordinator's use of AsyncBarrier

dotnet/src/Microsoft.Agents.AI.Workflows/ConfigurationExtensions.cs

@@ -16,7 +16,7 @@ public static class ConfigurationExtensions
     /// <param name="configured">The existing configuration for the subject type to be upcast to its parent type. Cannot be null.</param>
     /// <returns>A new <see cref="Configured{TParent}"/> instance that applies the original configuration logic to the parent type.</returns>
     public static Configured<TParent> Super<TSubject, TParent>(this Configured<TSubject> configured) where TSubject : TParent
-        => new(async config => await configured.FactoryAsync(config).ConfigureAwait(false), configured.Id, configured.Raw);
+        => new(async (config, runId) => await configured.FactoryAsync(config, runId).ConfigureAwait(false), configured.Id, configured.Raw);
 
     /// <summary>
     /// Creates a new configuration that treats the subject as its base type, allowing configuration to be applied at