Adds type checking for GraphQL data payload

[dankremniov]

Basically, this PR partially reverts changes to the types made in 8f989ef.

Moreover, I added graphql.test-d.ts file for type definition tests using ts-expect-error which should help to ensure that graphql data response will not be broken by other refactorings in the future. Unfortunately, type checking (such as tsc --noEmit) is not a part of build pipeline at the moment, and, thus, the added tests will not stop build even if they are broken. However, this should be fixed by #579. But for now, they are only useful for TS errors in IDE. Let me know if you think that it does not make sense to have them in this PR and I will remove them.

• Closes Typechecking of graphql data response doesn't work in versions >0.24.0 #555
• Closes graphql.query response type is not checked by TypeScript #574 (duplicate).

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currying-violet-03n18	Issue #574

[kettanaito]

Hey, @dankremniov. Thank you for providing a fix for the GraphQL typings!

It looks great, I will check out your branch and give it a test tomorrow. That definition test looks amazing, thank you for adding it also. I believe #579 can help us in running that definition test as well.

[kettanaito]

I took this opportunity to annotate all graphql.* usage examples in our integration tests. This should help us catch at least some percentage of type-related violations upon test runs. Plus, it gives a nice example of how to annotate your GraphQL mocks.

[kettanaito]

Thank you for fixing this, @dankremniov! Welcome to contributors!