PySpark XGBoost integration (#8020)

Co-authored-by: Hyunsu Cho <chohyu01@cs.washington.edu>
Co-authored-by: Jiaming Yuan <jm.yuan@outlook.com>

.github/workflows/main.yml

@@ -141,7 +141,7 @@ jobs:
     - name: Install Python packages
       run: |
         python -m pip install wheel setuptools
-        python -m pip install pylint cpplint numpy scipy scikit-learn
+        python -m pip install pylint cpplint numpy scipy scikit-learn pyspark pandas cloudpickle
     - name: Run lint
       run: |
         make lint

.github/workflows/python_tests.yml

@@ -92,6 +92,7 @@ jobs:
   python-tests-on-macos:
     name: Test XGBoost Python package on ${{ matrix.config.os }}
     runs-on: ${{ matrix.config.os }}
+    timeout-minutes: 90
     strategy:
       matrix:
         config: