Automatical updating of META-INF/services with annotations

[Voycawojka]

Is your feature request related to a problem? Please describe.
It's very easy to forget about updating META-INF/services for ServiceLoader every time HandlerFactory or ActionFactory is created/deleted.

Describe the solution you'd like
An annotation could be used to automaticaly detect factories. One existing solution is Google's AutoService. Using it with Knot.x would look like this:

@AutoService(HandlerFactory.class)
class MyHandlerFactory implements HandlerFactory {
  // …
}

No need to manually update the META-INF. Same for action factories.

Describe alternatives you've considered
Custom Knot.x annotations could be developed, but it would require a lot more work to do.

[Mateusz512]

Also please consider creating an annotation for getName method

@AutoService(Action.class)
@Name("my-custom-action")
class MyAction implements Action {
  // …
}