Implement default RO context (#64)

* Allocate default context buffers and initialize queue for management

- Allocated the status flag, g return, and atomic return buffers for
  the default context.
- Initialized `AtomicWFQueueProxy` instances to manage these buffers
  efficiently for concurrent access.

* Update `BlockHandle` with default context buffers

* Add default context flag and update buffer retrieval functions

- Added a flag to distinguish the default context from other contexts.
- Modified return buffer functionns and `get_status_flag` function to accommodate
  the default context

* Add default context primitive tests

-  get, put, get_nbi, put_nbi, g, and p APIs.

[ROCm/rocshmem commit: 867519e1d0]

projects/rocshmem/tests/functional_tests/tester.cpp

@@ -33,6 +33,7 @@
 #include "amo_bitwise_tester.hpp"
 #include "amo_extended_tester.hpp"
 #include "amo_standard_tester.hpp"
+#include "default_ctx_primitive_tester.hpp"
 #include "barrier_all_tester.hpp"
 #include "empty_tester.hpp"
 #include "ping_all_tester.hpp"
@@ -119,6 +120,26 @@ std::vector<Tester*> Tester::create(TesterArguments args) {
       if (rank == 0) std::cout << "Non-Blocking Puts ###" << std::endl;
       testers.push_back(new PrimitiveTester(args));
       return testers;
+    case DefaultCTXGetTestType:
+      if (rank == 0)
+        std::cout << "Default context Blocking Gets ###" << std::endl;
+      testers.push_back(new DefaultCTXPrimitiveTester(args));
+      return testers;
+    case DefaultCTXGetNBITestType:
+      if (rank == 0)
+        std::cout << "Default context Non-Blocking Gets ###" << std::endl;
+      testers.push_back(new DefaultCTXPrimitiveTester(args));
+      return testers;
+    case DefaultCTXPutTestType:
+      if (rank == 0)
+        std::cout << "Default context Blocking Puts ###" << std::endl;
+      testers.push_back(new DefaultCTXPrimitiveTester(args));
+      return testers;
+    case DefaultCTXPutNBITestType:
+      if (rank == 0)
+        std::cout << "Default context Non-Blocking Puts ###" << std::endl;
+      testers.push_back(new DefaultCTXPrimitiveTester(args));
+      return testers;
     case TeamCtxInfraTestType:
       if (rank == 0) std::cout << "Team Ctx Infra test ###" << std::endl;
       testers.push_back(new TeamCtxInfraTester(args));