Update collective APIs naming (#77)

* Update the naming convention for collective APIs to ensure consistency across the interface.

* Move all collective API declarations to rocshmem_COLL.hpp

* The following APIs were updated as part of this change:
  - `barrier`
  - `barrier_all`
  - `sync`
  - `sync_all`
  - `all_to_all`
  - `broadcast`
  - `fcollect`
  - `all_reduce`

* Update header file generation code for collective APIs

tests/functional_tests/sync_all_tester.cpp

@@ -53,11 +53,11 @@ __global__ void SyncAllTest(int loop, int skip, long long int *start_time,
         break;
       case WAVESyncAllTestType:
         if(wf_id == 0) {
-          rocshmem_ctx_wave_sync_all(ctx);
+          rocshmem_ctx_sync_all_wave(ctx);
         }
         break;
       case WGSyncAllTestType:
-        rocshmem_ctx_wg_sync_all(ctx);
+        rocshmem_ctx_sync_all_wg(ctx);
         break;
       default:
         break;