[ID Refactor] Shorten the length of JobID to 4 bytes (#5110)

* WIP

* Fix

* Add jobid test

* Fix

* Add python part

* Fix

* Fix tes

* Remove TODOs

* Fix C++ tests

* Lint

* Fix

* Fix exporting functions in multiple ray.init

* Fix java test

* Fix lint

* Fix linting

* Address comments.

* FIx

* Address and fix linting

* Refine and fix

* Fix

* address

* Address comments.

* Fix linting

* Fix

* Address

* Address comments.

* Address

* Address

* Fix

* Fix

* Fix

* Fix lint

* Fix

* Fix linting

* Address comments.

* Fix linting

* Address comments.

* Fix linting

* address comments.

* Fix

python/ray/services.py

@@ -615,6 +615,9 @@ def start_redis(node_ip_address,
     # can access it and know whether or not to enable cross-languages.
     primary_redis_client.set("INCLUDE_JAVA", 1 if include_java else 0)
 
+    # Init job counter to GCS.
+    primary_redis_client.set("JobCounter", 0)
+
     # Store version information in the primary Redis shard.
     _put_version_info_in_redis(primary_redis_client)