Enable fp8 support (#1101)

* initial checkin

* resolve cr comments

* resolve the build issue

* fix the data correctless issue

* update fp8 header file and update the unit test for fp8 support

* remove fp16 from fp8 headers

* fix ut issue and catch up the latest code from develop

* udate according to cr comments

* update ut according to cr comments

* update num floats for each SumPostDiv from 4 to 6

* update fp8 header file name

* fix the typo

test/common/EnvVars.cpp

@@ -114,6 +114,8 @@ namespace RcclUnitTesting
       dataTypes.push_back(ncclFloat32);
       dataTypes.push_back(ncclFloat64);
       dataTypes.push_back(ncclBfloat16);
+      dataTypes.push_back(ncclFp8E4M3);
+      dataTypes.push_back(ncclFp8E5M2);
     }
 
     // Build list of possible # GPU ranks based on env vars