[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>

jvm-packages/xgboost4j/src/main/scala/ml/dmlc/xgboost4j/scala/XGBoost.scala

@@ -46,6 +46,7 @@ object XGBoost {
     } else {
       prevBooster.booster
     }
+
     val xgboostInJava = checkpointParams.
       map(cp => {
           JXGBoost.trainAndSaveCheckpoint(