[BUG] Incorrect identifier for actors coming from Pipes or Forwards

[sleipnir]

Describe the bug

The protocol defines some types for workflos events such as pipes and forwards that do not have all the attributes so that it is possible to identify the target actor.
I suggest that we change to use the ActorId in these types

At the moment:

// Sends the output of a action of an Actor to the input of another action of an Actor
// Useful for handle `pipes` pattern:
// https://www.enterpriseintegrationpatterns.com/patterns/messaging/PipesAndFilters.html
message Pipe {
 // Target Actor
 string actor = 1;

 // Action. 
 string action_name = 2;
}

// Sends the input of a action of an Actor to the input of another action of an Actor
// Useful for handle `content-basead router` pattern
// https://www.enterpriseintegrationpatterns.com/patterns/messaging/ContentBasedRouter.html
message Forward {
 // Target Actor
 string actor = 1;

 // Action. 
 string action_name = 2;
}

Improvement suggestion:

// Sends the output of a action of an Actor to the input of another action of an Actor
// Useful for handle `pipes` pattern:
// https://www.enterpriseintegrationpatterns.com/patterns/messaging/PipesAndFilters.html
message Pipe {
 // Target Actor
 eigr.functions.protocol.actors.ActorId actor = 1;

 // Action. 
 string action_name = 2;
}

// Sends the input of a action of an Actor to the input of another action of an Actor
// Useful for handle `content-basead router` pattern
// https://www.enterpriseintegrationpatterns.com/patterns/messaging/ContentBasedRouter.html
message Forward {
 // Target Actor
 eigr.functions.protocol.actors.ActorId actor = 1;

 // Action. 
 string action_name = 2;
}

ping @eliasdarruda @marcellanz