Implement Storage TTL Extension in `get_fee_config`

[therealjhay]

Active fee configurations should have their persistent storage TTL extended during read requests.

Requirements and context

• Extend the persistent storage TTL of the DataKey::FeeConfig key during read requests if it exists

Suggested execution

• Modify get_fee_config in governance_contract/src/lib.rs
• Add the extend_ttl call for DataKey::FeeConfig persistent key before returning

Example commit message
refactor: extend persistent storage TTL when fetching fee config

[Onyedika3d]

@Onyedika3d has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello maintainers, I would like to work on this issue. I have analyzed the issue and reviewed the relevant parts of the codebase to fully understand the expected behavior and required changes. Based on my assessment, I am confident in the implementation approach needed to resolve it effectively. I have experience working with Node.js, TypeScript, NestJS, PostgreSQL, and MongoDB, and I will ensure the solution is clean, well-tested, and aligned with the project’s coding standards while also making sure existing functionality is not affected. I would appreciate the opportunity to take this on and contribute to the project.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Onyedika3d to this issue.

[drips-wave]

Congratulations, @Onyedika3d! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Onyedika3d: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @Onyedika3d as part of the Stellar Wave Program's 6th Wave 🥳

😎 @Onyedika3d: 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. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.