Merge branch 'branch-0.5.0' into 'branch-0.5.0'

MS-626 Refactor DataObj to support cache any type data

See merge request megasearch/milvus!682

Former-commit-id: ea7f8c5b62b006cbe0fc3faf8a2b70f8e170485c

cpp/src/cache/DataObj.h

@@ -27,7 +27,6 @@ class DataObj {
  public:
     virtual int64_t
     Size() = 0;
-
 };
 
 using DataObjPtr = std::shared_ptr<DataObj>;