Revert "Revert "[WIP] customize the C++ class for valueT"" (#77003)
This reverts commit ec841b0346ade6664d13d5d0263b8e6990bf4d95.
Fixes #ISSUE_NUMBER
Pull Request resolved: https://github.com/pytorch/pytorch/pull/77003
Approved by: https://github.com/shunting314, https://github.com/JackCaoG
