Egor Zhdan a12986ade4 [cxx-interop] Add CxxOptional protocol for std::optional ergonomics ...

This adds a protocol to the C++ standard library overlay which will improve the ergonomics of `std::optional` when used from Swift code.

As of now, the overlay adds an initializer of `Swift.Optional` that takes an instance of `CxxOptional` as a parameter.

2023-03-03 19:41:30 +01:00

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