Extensions
Extensions are a way to extend aiotaskqueue, by handling certain events like task completion or errors, they're heavily inspired by StrawberryGraphQL Extensions.
Multiple interfaces can be implemented by a single class to avoid having to register multiple extensions for a single feature.
Called when task is successfully completed and the result is already stored in the ResultBackend.
Called when an exception was raised during task execution.
Called when task is scheduled and added to the queue.
Wraps task execution, working similarly to a middleware, it should return a value compatible with task return type.