View codegen must create component registration

[ennru]

...even if the view doesn't require any UpdateHandler implementations.

[raboof]

AFAICS it already does? Added #204 to make sure this stays the case

[raboof]

... but I can reproduce a view not getting created in #203 - investigating

[raboof]

The view was missing the service type:

  option (akkaserverless.service) = {
    type: SERVICE_TYPE_VIEW
  };