Make `options.name_` private, and change all callsites to use `options.name()` (#26419)
Summary:
The implementation of several modules in C++ frontend currently has calls to `options.name_`, which is bad practice because `options.name_` should be a private options field and we should use `options.name()` to access its value. This PR makes `options.name_` actually private and changes all callsites of `options.name_` to `options.name()`.
After this change, we can change all module options to have a map as the underlying data structure, and require that all options must be able to be stored in `c10::IValue`. These changes together would make serializing module options much easier.
Note that this PR is BC-breaking in the following way:
Previously, calling `options.name_` in C++ module implementation works because `options.name_` was a public field. After this PR, `options.name_` becomes private, and to get the value of `options.name_` we should call `options.name()`, and to set the value of `options.name_` we should call `options.name(new_value)`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26419
Differential Revision: D17481507
Pulled By: yf225
fbshipit-source-id: 93e4ed0e1d79ef57104ad748809d03e25da61ed3
