Add userClaim field to custom moderation request schema

[AndyTWF]

Description

This PR updates the custom moderation request JSON schema documentation to include a new userClaim field. The field is added as an optional string parameter at the root level of the request object, alongside the existing headers field.

This change documents a new capability in the custom moderation API that allows users to specify a user claim for moderation requests.

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

https://claude.ai/code/session_01L4p6WChnatqPVHnQVH3kS5

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✨ Finishing Touches

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