[2023-02] Default Value Validation - everyone review please!

[benjie]

• RFC: Default value validation & coercion graphql-js#3049
• RFC: Default value validation & coercion graphql-js#3814
• [RFC] Default value coercion rules graphql-spec#793
• Yaacov: call to action: review the implementation PR and how it aligns with the spec PR.
• ACTION - everyone: review these PRs!

• assignee(s): Everyone! (@benjie is champion)
• source: https://github.com/graphql/graphql-wg/blob/main/notes/2023/2023-02.md#default-value-validation-status-check-5m-yaacov

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[benjie]

There has been plenty of time for review; we should get this merged. Marking ready for review