POC: improve normalizer performance (related collection links) #3559
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This is not meant to merge. Just as proof of concept of what is necessary to avoid the issue described in #2829
Unfortunately this would include maintaining a separate copy of ItemNormalizer for HAL (unless we try to integrate this upstream into api-platform).
The last commit shows the necessary changes to ItemNormalizer, most prominently in the method populateRelation.
Haven't had the time yet to run performance statistics.