CPP1117 — Add standardized annotation to override the IDL map to std::map mapping

For some use cases it would be more efficient to map a IDL map to a std::unordered_map (see https://en.cppreference.com/w/cpp/container/unordered_map), maybe standardize an annotation which can be used to override the mapping to std::map to the type as specified by the annotation?

Defer

Other languages have similar issues like using TreeMap or HashMap in Java.

Defer resolution on this until standard annotation can be provided in the IDL 4 spec or the IDL Working Group has a common approach to use across language mappings.