[GR-39852] [GR-40423] Provide FieldValueTransformer API. #4820
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See the JavaDoc of the new class
FieldValueTransformer
for the API description.FieldValueTransformer
replaces theCustomFieldValueProvider
/CustomFieldValueComputer
/CustomFieldValueTransformer
that we had inRecomputeValueField
for the kindCustom
. But more importantly from an API point of view, the transformer can now also be registered from aFeature
, i.e., without the need to use the substitution mechanism.For simplicity, the actual implementation of transformations did not change. It is still done via the substitution universe, i.e, the field value transformer are still invoked from
ComputedValueField
. This PR also does not remove existingRecomputeFieldValue
annotations in our code base.