[Breaking] Switch from rabit to the collective communicator (#8257)

* Switch from rabit to the collective communicator

* fix size_t specialization

* really fix size_t

* try again

* add include

* more include

* fix lint errors

* remove rabit includes

* fix pylint error

* return dict from communicator context

* fix communicator shutdown

* fix dask test

* reset communicator mocklist

* fix distributed tests

* do not save device communicator

* fix jvm gpu tests

* add python test for federated communicator

* Update gputreeshap submodule

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

src/logging.cc

@@ -4,14 +4,12 @@
  * \brief Implementation of loggers.
  * \author Tianqi Chen
  */
-#include <rabit/rabit.h>
-
 #include <iostream>
-#include <map>
 
 #include "xgboost/parameter.h"
 #include "xgboost/logging.h"
-#include "xgboost/json.h"
+
+#include "collective/communicator-inl.h"
 
 #if !defined(XGBOOST_STRICT_R_MODE) || XGBOOST_STRICT_R_MODE == 0
 // Override logging mechanism for non-R interfaces
@@ -32,7 +30,7 @@ ConsoleLogger::~ConsoleLogger() {
 
 TrackerLogger::~TrackerLogger() {
   log_stream_ << '\n';
-  rabit::TrackerPrint(log_stream_.str());
+  collective::Print(log_stream_.str());
 }
 
 }  // namespace xgboost