feat: implement useContractEvents() - stream Soroban contract events via RPC

[gloriaelishahabu]

[jonah-Elisha10]

@jonah-Elisha10 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hi maintainer. can you assign me this issue to work on

ℹ️ Repo Maintainers: To accept this application, review their application or assign @jonah-Elisha10 to this issue.

[devgbmuyiwa]

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

I can work on this issue
Kindly assign this to me.

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

[drips-wave]

Congratulations, @jonah-Elisha10! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @jonah-Elisha10: 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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