54: Exception Alternatives

This exercise is pending. Quick notes about this exercise:

• Talk about the possible problems with exceptions using a demo

• Show how to not use them

• std::optional, std::expected

• Talk about nodiscard as a hack for error handling.

• https://en.cppreference.com/cpp/utility/any

• https://en.cppreference.com/cpp/utility/expected

• https://en.cppreference.com/cpp/utility/variant

• https://en.cppreference.com/cpp/utility/optional