Prep for Scala 3.4 #1
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…f `LabelledGeneric.Inst`.
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Scala 3.4 introduced a spec for match types that results in match types on
->>either no longer compiling or working properly (for example, scala/scala3#17944).This removes all match types on
->>and reworks type class instances accordingly. I've introduced a new package-privateformless.record.FindFieldtype class that's produced by a macro and is used by other type classes to find a matching field in a record and extract/modify/remove it. There's an equivalentformless.tuple.FindFieldtype class that's used for finding fields in plain tuples (not records).This also adds Scala 3.4.0-RC4 to the build so future changes are tested against it, but ensures that we still use Scala 3.3.1 for publishing artifacts.