Add nullability annotations in DataFetchingEnvironment & sub-classes #3582
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Salzian
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While using Netflix' DGS with Kotlin, we ran into an issue where it was not immediately clear that
DataFetchingEnvironment.getLocalContextcan returnnull. After reading the documentation and the rest of theDataFetchingEnvironmentinterface, I noticed the lack of nullability annotations for Kotlin interoperability. However, I also saw that other classes in this project already use the Jetbrains annotations.In this PR I added nullability annotations to all methods of the
DataFetchingEnvironmentinterface that had mentions about nullability in their documentation. For patching the whole class I currently lack the overview of the bigger picture of this interface.I followed through on sub-classes that override these methods.