Change Details

[ENG-5719](https://linear.app/comm/issue/ENG-5719/improve-pointers-handling#comment-3768ecd3). We wan't to use it on web too and finally remove `MessageWithMedias`, but Emscripten does not support `std::pair` - the easiest way to fix that is to just change it to struct. Depends on D14667

[ENG-5719](https://linear.app/comm/issue/ENG-5719/improve-pointers-handling#comment-3768ecd3). We want to use it on the web too and finally remove `MessageWithMedias`, but Emscripten does not support `std::pair` - the easiest way to fix that is to just change it to a struct. Depends on D14667

[ENG-5719](https://linear.app/comm/issue/ENG-5719/improve-pointers-handling#comment-3768ecd3). We wan't to use it on the web too and finally remove `MessageWithMedias`, but Emscripten does not support `std::pair` - the easiest way to fix that is to just change it to a struct. Depends on D14667