Remove actor handle IDs (#5889)

* Remove actor handle ID from main ActorHandle constructor

* Set the actor caller ID when calling submit task instead of in the actor handle

* Remove ActorHandle::Fork, remove actor handle ID from protobuf

* Make inner actor handle const, remove new_actor_handles

* Move caller ID into the common task spec, start refactoring raylet

* Some fixes for forking actor handles

* Store ActorHandle state in CoreWorker, only expose actor ID to Python

* Remove some unused fields

* lint

* doc

* fix merge

* Remove ActorHandleID from python/cpp

* doc

* Fix core worker test

* Move actor table subscription to CoreWorker, reset actor handles on actor failure

* lint

* Remove GCS client from direct actor

* fix tests

* Fix

* Fix tests for raylet codepath

* Fix local mode

* Fix multithreaded test

* Fix AsyncSubscribe issue...

* doc

* fix serve

* Revert bazel

python/ray/includes/common.pxd

@@ -8,7 +8,6 @@ from libcpp.vector cimport vector as c_vector
 
 from ray.includes.unique_ids cimport (
     CActorID,
-    CActorHandleID,
     CJobID,
     CWorkerID,
     CObjectID,
@@ -199,19 +198,9 @@ cdef extern from "ray/core_worker/task_interface.h" nogil:
             const c_vector[c_string] &dynamic_worker_options)
 
     cdef cppclass CActorHandle "ray::ActorHandle":
-        CActorHandle(
-            const CActorID &actor_id, const CActorHandleID &actor_handle_id,
-            const CJobID &job_id, const CObjectID &initial_cursor,
-            const CLanguage actor_language, c_bool is_direct_call,
-            const c_vector[c_string] &actor_creation_task_function_descriptor)
-        CActorHandle(CActorHandle &other, c_bool in_band)
-        CActorHandle(
-            const c_string &serialized, const CTaskID &current_task_id)
+        CActorHandle(const c_string &serialized)
 
         CActorID GetActorID() const
-        CActorHandleID GetActorHandleID() const
-        unique_ptr[CActorHandle] Fork()
-        unique_ptr[CActorHandle] ForkForSerialization()
         void Serialize(c_string *output)
 
 cdef extern from "ray/gcs/gcs_client_interface.h" nogil: