feat: add dataFetcherResult option to return both errors and partial data

[vmiliantsei]

📝 Description

• Adds option to generate classes that use https://github.com/graphql-java/graphql-java/blob/master/src/main/java/graphql/execution/DataFetcherResult.java type, so it's possible to return both partial data and errors for a field

[github-actions]

🎉 This PR is included in version 3.7.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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