[ID Refactor] Refactor ActorID, TaskID and ObjectID (#5286)

* Refactor ActorID, TaskID on the Java side.

Left a TODO comment

WIP for ObjectID

ADD test

Fix

Add java part

Fix Java test

Fix

Refine test.

Enable test in CI

* Extra a helper function.

* Resolve TODOs

* Fix Python CI

* Fix Java lint

* Update .travis.yml

Co-Authored-By: Stephanie Wang <swang@cs.berkeley.edu>

* Address some comments.

Address some comments.

Add id_specification.rst

Reanme id_specification.rst to id_specification.md

typo

Address zhijun's comments.

Fix test

Address comments.

Fix lint

Address comments

* Fix test

* Address comments.

* Fix build error

* Update src/ray/design_docs/id_specification.md

Co-Authored-By: Stephanie Wang <swang@cs.berkeley.edu>

* Update src/ray/design_docs/id_specification.md

Co-Authored-By: Stephanie Wang <swang@cs.berkeley.edu>

* Update src/ray/design_docs/id_specification.md

Co-Authored-By: Stephanie Wang <swang@cs.berkeley.edu>

* Update src/ray/design_docs/id_specification.md

Co-Authored-By: Stephanie Wang <swang@cs.berkeley.edu>

* Update src/ray/design_docs/id_specification.md

Co-Authored-By: Stephanie Wang <swang@cs.berkeley.edu>

* Address comments

* Update src/ray/common/id.h

Co-Authored-By: Stephanie Wang <swang@cs.berkeley.edu>

* Update src/ray/common/id.h

Co-Authored-By: Stephanie Wang <swang@cs.berkeley.edu>

* Update src/ray/common/id.h

Co-Authored-By: Stephanie Wang <swang@cs.berkeley.edu>

* Update src/ray/design_docs/id_specification.md

Co-Authored-By: Hao Chen <chenh1024@gmail.com>

* Update src/ray/design_docs/id_specification.md

Co-Authored-By: Hao Chen <chenh1024@gmail.com>

* Address comments.

* Address comments.

* Address comments.

* Update C++ part to make sure task id is generated determantic

* WIP

* Fix core worker

* Fix Java part

* Fix comments.

* Add Python side

* Fix python

* Address comments

* Fix linting

* Fix

* Fix C++ linting

* Add JobId() method to TaskID

* Fix linting

* Update src/ray/common/id.h

Co-Authored-By: Hao Chen <chenh1024@gmail.com>

* Update java/api/src/main/java/org/ray/api/id/TaskId.java

Co-Authored-By: Hao Chen <chenh1024@gmail.com>

* Update java/api/src/main/java/org/ray/api/id/TaskId.java

Co-Authored-By: Hao Chen <chenh1024@gmail.com>

* Update java/api/src/main/java/org/ray/api/id/ActorId.java

Co-Authored-By: Hao Chen <chenh1024@gmail.com>

* Address comments

* Add DriverTaskId embeding job id

* Fix tests

* Add python dor_fake_driver_id

* Address comments and fix linting

* Fix CI

python/ray/tests/test_basic.py

@@ -2520,13 +2520,14 @@ def test_global_state_api(shutdown_only):
     assert len(task_table) == 1
     assert driver_task_id == list(task_table.keys())[0]
     task_spec = task_table[driver_task_id]["TaskSpec"]
-    nil_id_hex = ray.ObjectID.nil().hex()
+    nil_unique_id_hex = ray.UniqueID.nil().hex()
+    nil_actor_id_hex = ray.ActorID.nil().hex()
 
     assert task_spec["TaskID"] == driver_task_id
-    assert task_spec["ActorID"] == nil_id_hex
+    assert task_spec["ActorID"] == nil_actor_id_hex
     assert task_spec["Args"] == []
     assert task_spec["JobID"] == job_id.hex()
-    assert task_spec["FunctionID"] == nil_id_hex
+    assert task_spec["FunctionID"] == nil_unique_id_hex
     assert task_spec["ReturnObjectIDs"] == []
 
     client_table = ray.nodes()
@@ -2551,7 +2552,7 @@ def test_global_state_api(shutdown_only):
     task_id = list(task_id_set)[0]
 
     task_spec = task_table[task_id]["TaskSpec"]
-    assert task_spec["ActorID"] == nil_id_hex
+    assert task_spec["ActorID"] == nil_actor_id_hex
     assert task_spec["Args"] == [1, "hi", x_id]
     assert task_spec["JobID"] == job_id.hex()
     assert task_spec["ReturnObjectIDs"] == [result_id]