Add structured log event emitted when a creator key TTL extension is triggered

[Chucks1093]

Summary

When the contract extends a creator key's persistent storage TTL, there is no observable event for monitoring tools to react to. A Soroban contract event should be emitted at the time of extension so indexers can track TTL health without polling storage directly.

Scope

• Emit a contract event on TTL extension with fields: creator_id, extended_at_ledger, new_expiry_ledger
• Use a dedicated event topic so indexers can filter on it without scanning all events
• Confirm the event appears in the transaction result meta when simulated in tests

Acceptance Criteria

• Event emitted on every TTL extension call
• Event contains creator_id, extended_at_ledger, new_expiry_ledger
• Topic is distinct from buy/sell events
• Event visible in simulated transaction meta in tests

ETA: 12 hours

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Coordinate on Telegram

[OluRemiFour]

I can take this on. I've gone through the details and will provide a well-tested solution aligned with the project standards.

[Ayinkx01]

Hi i would like to work on this issue
please