Function SubscriberMiddleware

SubscriberMiddleware(
context: BlueprintContext<IBlueprint, ClassType>,
next: NextPipe<BlueprintContext<IBlueprint, ClassType>, IBlueprint>,
): Promise<IBlueprint>
Middleware to add subscribers to the blueprint.

This middleware identifies modules marked as subscribers and adds them to the blueprint's list of subscribers.
Parameters
- context: BlueprintContext<IBlueprint, ClassType>
  The configuration context containing modules and blueprint.
- next: NextPipe<BlueprintContext<IBlueprint, ClassType>, IBlueprint>
  The next function in the pipeline.
Returns Promise<IBlueprint>
The updated blueprint.
Example
```
SubscriberMiddleware({ modules, blueprint }, next);
```