Add retry with exponential backoff and circuit breaker for Soroban RPC

[RUKAYAT-CODER]

Background

Transient RPC failures likely cause request failures or blocking retries without a circuit breaker, harming latency and resilience.

Implementation Plan

• Add exponential backoff with jitter and a circuit breaker\n- Expose breaker state via health/metrics
• Add benchmarks/metrics capturing before/after impact
• Add regression tests where applicable
• Document the change

Acceptance Criteria

• Measurable performance/efficiency improvement demonstrated with before/after numbers
• No regression in existing functionality
• Tests pass and code follows project standards
• Change is documented

[Joseph-1-Duro]

@Joseph-1-Duro has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I would love to work on your project.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Joseph-1-Duro to this issue.

[chainsmt]

@chainsmt has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, can I work on this issue?

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

[drips-wave]

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

🧑‍💻 @ciynthia: 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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