[Serializer] Move the normalization logic in an abstract class #17191
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As suggested by @xabbuh, move all the normalization logic for objects in an abstract class.
It will ease the maintenance as well as adding new features such as #17113 and #16143.
I've introduced a new abstract class to avoid BC breaks in
AbstractNormalizer
. As a (good) side effect, all normalizers now benefits from the caching system introduced in #16547.