Implement Circuit Breaker for Soroban RPC Calls

[Olowodarey]

Description:
Add circuit breaker pattern to Soroban RPC calls to prevent cascading failures when the RPC service is degraded or unavailable.

Acceptance Criteria:

• Implement circuit breaker using opossum library
• Configurable failure threshold and timeout
• Automatic fallback to secondary RPC endpoints
• Circuit breaker state monitoring
• Metrics for circuit breaker trips
• Admin API to manually open/close circuit
• Graceful degradation when all RPCs are down

[whitezaddy]

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

I've gone through your requirement thoroughly, I will fix this issues and implement a clean pull request to match your acceptance criteria

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

[Dev-Vik-Tor]

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

Hey Maintainer, I have gone through the details of the issue and i am capable of resolving it, I would love to be assigned to work on it ASAP. Thanks in advance

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Dev-Vik-Tor to this issue.

[drips-wave]

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

🧑‍💻 @Dev-Vik-Tor: 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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[drips-wave]

This issue has been completed by @Dev-Vik-Tor as part of the Stellar Wave Program's 3rd Wave 🥳

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