Common interface for collective communication (#8057)

* implement broadcast for federated communicator

* implement allreduce

* add communicator factory

* add device adapter

* add device communicator to factory

* add rabit communicator

* add rabit communicator to the factory

* add nccl device communicator

* add synchronize to device communicator

* add back print and getprocessorname

* add python wrapper and c api

* clean up types

* fix non-gpu build

* try to fix ci

* fix std::size_t

* portable string compare ignore case

* c style size_t

* fix lint errors

* cross platform setenv

* fix memory leak

* fix lint errors

* address review feedback

* add python test for rabit communicator

* fix failing gtest

* use json to configure communicators

* fix lint error

* get rid of factories

* fix cpu build

* fix include

* fix python import

* don't export collective.py yet

* skip collective communicator pytest on windows

* add review feedback

* update documentation

* remove mpi communicator type

* fix tests

* shutdown the communicator separately

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

tests/cpp/CMakeLists.txt

@@ -22,7 +22,7 @@ if (PLUGIN_FEDERATED)
   target_include_directories(testxgboost PRIVATE ${xgboost_SOURCE_DIR}/plugin/federated)
   target_link_libraries(testxgboost PRIVATE federated_client)
 else (PLUGIN_FEDERATED)
-  file(GLOB_RECURSE FEDERATED_TEST_SOURCES "plugin/*_federated_*.cc")
+  file(GLOB_RECURSE FEDERATED_TEST_SOURCES "plugin/*_federated_*.*")
   list(REMOVE_ITEM TEST_SOURCES ${FEDERATED_TEST_SOURCES})
 endif (PLUGIN_FEDERATED)