This commit moves the responsibility of naming classes to the GenerationContext. This was already largely the case before, except that the concept of a "mainTarget" and "featureNamePrefix" was specific to bean factory initialization contributors. ClassNameGenerator should now be instantiated with a default target and an optional feature name prefix. As a result, it does no longer generate class names in the "__" package. GeneratedClasses can now provide a new, unique, GeneratedClass or offer a container for retrieving the same GeneratedClass based on an identifier. This lets all contributors use this facility rather than creating JavaFile manually. This also means that ClassNameGenerator is no longer exposed. Because the naming conventions are now part of the GenerationContext, it is required to be able to retrieve a specialized version of it if a code generation round needs to use different naming conventions. A new withName method has been added to that effect. Closes gh-28585
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