Migrating rccl and rccl-tests (#2750)

* Migrating rccl and rccl-tests

* Adding missing submodules for rccl

.gitmodules

@@ -102,3 +102,17 @@
 	path = projects/rocprofiler-systems/external/spdlog
 	url = https://github.com/gabime/spdlog.git
 	tag = v1.16.0
+[submodule "projects/rccl/ext-src/mscclpp"]
+	path = projects/rccl/ext-src/mscclpp
+	url = https://github.com/microsoft/mscclpp.git
+	ignore = dirty
+	shallow = true
+[submodule "projects/rccl/ext-src/json"]
+	path = projects/rccl/ext-src/json
+	url = https://github.com/nlohmann/json.git
+	ignore = dirty
+	shallow = true
+[submodule "projects/rccl/ext-src/rocSHMEM"]
+	path = projects/rccl/ext-src/rocSHMEM
+	url = https://github.com/ROCm/rocSHMEM.git
+	branch = develop