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

[ROCm/rocshmem commit: 526105d315]

projects/rocshmem/tests/functional_tests/tester.cpp

@@ -560,7 +560,7 @@ bool Tester::peLaunchesKernel() {
 }
 
 void Tester::print(uint64_t size) {
-  if (args.myid != 0) {
+  if (args.myid != 0 || !_print_results) {
     return;
   }