instanceof check for "ActorCallError"/"QueryCallRejectedError"/"UpdateCallRejectedError"

[alexeychirkov]

Hey!

Is it intentional that the implementations of the ActorCallError, QueryCallRejectedError, and UpdateCallRejectedError classes do not use Object.setPrototypeOf?

The issue is that it currently prevents a type-safe check for an error thrown using this code:

try {
   myActor.notFoundQueryMethod();
} catch(e) {
   if (e instanceof QueryCallRejectedError) {
      // profit!
   }
}

The only type-safe check that works now is e instanceof AgentError, which is useless because AgentError has no properties to check.