[Contract] Add get_version function to contract

[Yunusabdul38]

Description: Complement the version constant by exposing it through a public view function for off-chain services. Tasks:

Implement get_version(env: Env) -> u32 in the contract implementation.
Return the custom VERSION constant.
Add a simple unit test for this getter.

[Rajkoli145]

@Rajkoli145 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi @Agora-Events,
I’d like to work on this issue.

I’ll add a get_version function to the contract, keeping it simple and consistent with the existing structure, and ensure it passes all tests and CI checks.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Rajkoli145 to this issue.

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Congratulations, @Rajkoli145! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Rajkoli145: 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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This issue has been completed by @Rajkoli145 as part of the Stellar Wave Program's 3rd Wave 🥳

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