refactor: Change C style casts to C++ style (Part 6) (facebookincubat…

…or#11728)

Summary:
As per the security guideline in
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#es49-if-you-must-use-a-cast-use-a-named-cast

Covers the findings velox/dwio/parquet/thrift/ParquetThriftTypes.cpp

Pull Request resolved: facebookincubator#11728

Reviewed By: kKPulla

Differential Revision: D67882296

Pulled By: kevinwilfong

fbshipit-source-id: b990604b3e26fcc362de99195feed954d8db585d