FUNCTION] implement `get_top_contributor_for_campaign`

[Akshola00]

• Title: Find the "Whale" donor for a campaign.
• Description: Return the address that donated the highest single amount to a specific campaign.
• Requirements:
  • Track the max_donation during the donate call.
  • Test: Verify correct address is returned after multiple donations.

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[henrypeters]

@henrypeters has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I'd like to take on this issue! Implementing get_top_contributor_for_campaign is a well-scoped task and I have solid experience working with smart contract storage patterns and donation tracking logic in this type of Web3 context.

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[ryzen-xp]

@ryzen-xp has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi maintainers 👋
I’m a blockchain developer with strong expertise in Stellar, Rust,TS and Stellar SDK integrations. I’ve worked on multiple Stellar-based smart contract and backend systems.

I understand the scope of this issue and can deliver a reliable, production-quality solution with proper tests and documentation.
Plz assign me !!

ETA: 24 hours

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Congratulations, @henrypeters! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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[drips-wave]

This issue has been completed by @henrypeters as part of the Stellar Wave Program's 2nd Wave 🥳

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