cxx: New package
Start new package that provides C++ amendments to be used by libgolang and its users. Current functionality: dict and set that wrap std::unordered_map and std::unordered_set into ergonomic interface. The code originates from wendelin.core: https://lab.nexedi.com/kirr/wendelin.core/blob/5a045ed1/wcfs/internal/wcfs_misc.h#L214-257 Pyx/nogil only.
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