Add public creator query key constants

[Chucks1093]

Summary

Add shared constants for public creator query parameter keys.

Acceptance Criteria

• query keys live in a shared constants location
• parsing helpers can import the constants directly
• naming is scoped clearly to public creator queries

Contributor coordination: https://t.me/accesslayerorg

[codewithzubair07]

@codewithzubair07 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi Maintainers,

I’d like to take this issue. I’ll add clearly scoped shared constants for public creator query parameter keys in a central location, ensuring they can be easily imported by parsing helpers and other modules.

I’ll keep naming consistent and aligned with existing conventions to maintain clarity and avoid duplication.

ETA: a few hours.

Thanks!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @codewithzubair07 to this issue.

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Congratulations, @codewithzubair07! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @codewithzubair07: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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This issue has been completed by @codewithzubair07 as part of the Stellar Wave Program's 3rd Wave 🥳

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