BugFix: Nested List Input Coercion not matching GraphQL spec

[abhinand-c]

This PR fixes the issue mentioned in #3858 to align input coercion of nested list with the GraphQL spec.

Changes (Similar to graphql-python/graphql-core#194)

• Adds check to validate and raises error for the condition
• Updated tests to reflect the new logic, and validate error

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: abhinand-c / name: Abhinand C (45e9ebe, 2cd4878)

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[abhinand-c]

Hi @Cito @IvanGoncharov
I hope everything's alright here. Is there anything more to do? And could you please review this PR?

[yaacovCR]

Hi, see #3858 (comment)

TLDR I think a helpful next step might be to bring the underlying issue to the attention of the WG at the next meeting.

[abhinand-c]

Closing this PR as spec was updated to clarify the isssue, and no change in implementation is required.

Ref:

• Nested List Input Coercion not matching GraphQL spec #3858 (comment)
• Fix coercion table for list graphql-spec#1057

[yaacovCR]

Thanks @abhinand-c for bringing this to the forefront!