Add `creator` address to `invoice_expired` event data

[Kingsman-99]

Description

invoice_expired in contracts/split/src/events.rs emits (deadline, funded, event_seq) but not the creator address. Including the creator in the data payload lets indexers attribute expired invoices to creators without a separate get_invoice call.

Acceptance Criteria

• Update invoice_expired to accept a creator: &Address parameter
• Include creator in the event data: (deadline, funded, creator, event_seq)
• Update all call sites in lib.rs
• Update tests that assert the event data shape
• cargo test passes

Context

• Target file: contracts/split/src/events.rs

[Malcolm-Wander]

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Hello maintainer,I’d love to work on this issue please,I promise to do a good and swift job..thank you.

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[AgentX010]

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[directorfloo]

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I would love to work on this issue professionally, please assign it to me

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[toniasteve15-ui]

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[oyeyemipamilerin6-collab]

@oyeyemipamilerin6-collab has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I've gone through your requirement thoroughly, I will fix this issues and implement a clean pull request to match your acceptance criteria

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[GenesisPray]

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please assign me this issues

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@GenesisPray's PR #657 was approved and merged by @Kingsman-99.

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