Implement rocshmem_ptr in IPC conduit (#197)

* Implement `rocshmem_ptr` in IPC conduit

* tests: add functional test for `rocshmem_ptr`
  - Add safety check for pointer access and condition check before printing results for `rocshmem_ptr` test
  - Use `rocshmem_put` to store `rocshmem_ptr` availability for data validation

tests/functional_tests/tester_arguments.cpp

@@ -96,11 +96,11 @@ TesterArguments::TesterArguments(int argc, char *argv[]) {
     case WAVESyncAllTestType:
     case WGSyncAllTestType:
     case SyncTestType:
-    case ShmemPtrTestType:
       min_msg_size = 8;
       max_msg_size = 8;
       break;
     case PingPongTestType:
+    case ShmemPtrTestType:
       min_msg_size = 4;
       max_msg_size = 4;
       break;