Add read-only creator key symbol method

[Chucks1093]

Summary

Add a read-only method that returns the configured symbol for a creator key.

Acceptance Criteria

• method returns the stored symbol for a valid creator
• method does not mutate state
• tests cover a successful read

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

[sudo-robi]

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

Hi, i am Paschal a full stack developer, a smart contract developer and I would like to work on this issue.

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[drips-wave]

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

🧑‍💻 @sudo-robi: 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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[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @sudo-robi as part of the Stellar Wave Program's 4th Wave 🥳

Moderator's reason: The issue was resolved and merged in PR: #115

😎 @sudo-robi: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here.

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ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.