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

scripts/functional_tests/driver.sh

@@ -200,6 +200,11 @@ TestRMAPut() {
   ExecTest  "p"                2       8            1         32
   ExecTest  "p"                2       16           128       4
 
+  ExecTest  "shmemptr"         2       1            1         8
+  ExecTest  "shmemptr"         2       1            1024      8
+  ExecTest  "shmemptr"         2       8            1         8
+  ExecTest  "shmemptr"         2       16           128       8
+
   ################################ Non-Blocking ################################
 
   ExecTest  "putnbi"           2       1            1         1048576