[BLOCKING] [jvm-packages] add gpu_hist and enable gpu scheduling (#5171)

* [jvm-packages] add gpu_hist tree method

* change updater hist to grow_quantile_histmaker

* add gpu scheduling

* pass correct parameters to xgboost library

* remove debug info

* add use.cuda for pom

* add CI for gpu_hist for jvm

* add gpu unit tests

* use gpu node to build jvm

* use nvidia-docker

* Add CLI interface to create_jni.py using argparse

Co-authored-by: Hyunsu Cho <chohyu01@cs.washington.edu>

doc/jvm/index.rst

@@ -202,6 +202,14 @@ If you are on Mac OS and using a compiler that supports OpenMP, you need to go t
 
 in order to get the benefit of multi-threading.
 
+Building with GPU support
+-------------------------
+If you want to build XGBoost4J that supports distributed GPU training, run
+
+.. code-block:: bash
+
+  mvn -Duse.cuda=ON install
+
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