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[JAVA] Only add the JsonCreator import when the file contains an enum

Open Administrator requested to merge github/fork/FieteO/conditional-enum-jsoncreator-import into master

Created by: FieteO

Only add the import for the @JsonCreator annotation when the model actually contains it. Currently this import is being added to every generated model, even though it is only needed when a model contains an enum.

This is a general annoyance that could be fixed. In my reasonably large backend service there are 7000 problems, with ~ 6500 coming from unused imports in generated code.

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