Add allowed sort field constants for creator list

[Chucks1093]

Summary

Add shared constants for creator list sort field names.

Acceptance Criteria

• allowed sort fields live in a shared constants location
• list parsing flow can reuse the constants directly
• naming is scoped clearly to creator list sorting

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

[Chinonso-Peter]

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

Can i work on this issue

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

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[drips-wave]

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

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