Add team information to the context

* Update roc_shmem_ctx_fence API to use team-relative PE numbering
* Update backend to populate team_opaque member of ROC_SHMEM_CTX_DEFAULT (used to store information about the team wrt TEAM_WORLD)

src/ipc/context_ipc_device.cpp

@@ -88,8 +88,8 @@ __device__ void IPCContext::getmem_nbi(void *dest, const void *source,
 }
 
 __device__ void IPCContext::fence() {
-  for (int i{0}; i < num_pes; i++) {
-    detail::atomic::store<int, detail::atomic::memory_scope_system>(&fence_pool[i], 1, orders_);
+  for (int i{0}, j{tinfo->pe_start}; i < tinfo->size; i++, j += tinfo->stride) {
+    detail::atomic::store<int, detail::atomic::memory_scope_system>(&fence_pool[j], 1, orders_);
   }
 }