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

src/ipc/context_ipc_device.cpp

@@ -106,6 +106,10 @@ __device__ void IPCContext::quiet() {
 
 __device__ void *IPCContext::shmem_ptr(const void *dest, int pe) {
   void *ret = nullptr;
+  void *dst = const_cast<void *>(dest);
+    uint64_t L_offset =
+        reinterpret_cast<char *>(dst) - ipcImpl_.ipc_bases[my_pe];
+    ret = ipcImpl_.ipc_bases[pe] + L_offset;
   return ret;
 }