feat: implement useContractStorage() - read/write Soroban persistent storage

[gloriaelishahabu]

[Adediwura-dev]

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

hi, i can implement this for you

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[teeschima]

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

Good day maintainer DRIPSLORD, please assign this task to me boss

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[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.

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[drips-wave]

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

🧑‍💻 @devgbmuyiwa: 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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