[wheel] cut "cpp" out of "all" (#46886)

all will not include "cpp" anymore; use "allcpp" instead if "cpp" is
required. "all" will just be "all python".

Signed-off-by: Lonnie Liu <lonnie@anyscale.com>

python/setup.py

@@ -237,7 +237,7 @@ def get_packages(self):
         ],
         "default": [
             # If adding dependencies necessary to launch the dashboard api server,
-            # please add it to dashboard/optional_deps.py as well.
+            # please add it to python/ray/dashboard/optional_deps.py as well.
             "aiohttp >= 3.7,<3.10.0",
             "aiohttp_cors",
             "colorful",
@@ -316,9 +316,19 @@ def get_packages(self):
         )
     )
 
+    # "all" will not include "cpp" anymore. It is a big depedendency
+    # that most people do not need.
+    #
+    # Instead, when cpp is supported, we add a "all-cpp".
     setup_spec.extras["all"] = list(
-        set(chain.from_iterable(setup_spec.extras.values()))
+        set(
+            chain.from_iterable([v for k, v in setup_spec.extras.items() if k != "cpp"])
+        )
     )
+    if RAY_EXTRA_CPP:
+        setup_spec.extras["all-cpp"] = list(
+            set(setup_spec.extras["all"] + setup_spec.extras["cpp"])
+        )
 
 # These are the main dependencies for users of ray. This list
 # should be carefully curated. If you change it, please reflect