Adding FP16 cases to unit tests(#1093)

Signed-off-by: Tim Hu <timhu102@amd.com>

test/SendRecvTests.cpp

@@ -12,7 +12,7 @@ namespace RcclUnitTesting
     TestBed testBed;
 
     // Configuration
-    std::vector<ncclDataType_t> const& dataTypes       = {ncclInt32, ncclFloat64};
+    std::vector<ncclDataType_t> const& dataTypes       = {ncclInt32, ncclFloat16, ncclFloat64};
     std::vector<int>            const  numElements     = {1048576, 53327, 1024, 0};
     bool                        const  inPlace         = false;
     bool                        const  useManagedMem   = false;