Offer RawExtractIf as hash_{table,map}::Extractor
#683
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Essentially, until TAIT (rust-lang/rust#63063) is stable, we're going to need some form of
RawExtractIfinternally, and so will external users if they want to wrap their tables in a special way. So, let's actually make the API public under the nameExtractor.This is also the last bit needed to make
HashSetnot depend on the raw table implementation, being fully implemented viaHashMap.