[SPARK-50578][PYTHON][SS][FOLLOW-UP] Add the Python new package into setup.py

### What changes were proposed in this pull request?

This PR is a followup of apache#49156 that adds the Python new package into `setup.py`.

### Why are the changes needed?

So pip installed pyspark support states with streaming queries

### Does this PR introduce _any_ user-facing change?

No, the main change has not been released out yet.

### How was this patch tested?

Will monitor the scheduled build https://github.com/apache/spark/actions/runs/13618426037/job/38064498674

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes apache#50128 from HyukjinKwon/SPARK-50578-followup2.

Authored-by: Hyukjin Kwon <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: HyukjinKwon

python/packaging/classic/setup.py

@@ -291,6 +291,7 @@ def run(self):
             "pyspark.sql.plot",
             "pyspark.sql.protobuf",
             "pyspark.sql.streaming",
+            "pyspark.sql.streaming.proto",
             "pyspark.sql.worker",
             "pyspark.streaming",
             "pyspark.bin",

python/packaging/client/setup.py

@@ -168,6 +168,7 @@
         "pyspark.sql.plot",
         "pyspark.sql.protobuf",
         "pyspark.sql.streaming",
+        "pyspark.sql.streaming.proto",
         "pyspark.sql.worker",
         "pyspark.streaming",
         "pyspark.pandas",