Build exponential backoff retry strategies on indexer_metrics_collector

[francisdouglas-ux]

Problem & Goal

Implement backoff rules within the indexer_metrics_collector component to retry RPC connection timeouts gracefully.

Context & Components

• Target Repository: escrow-backend
• Module/Component: indexer_metrics_collector (Poller performance telemetry tracker)

Implementation Details

1. Review the existing codebase inside the escrow-backend directory.
2. Locate the source files relating to indexer_metrics_collector.
3. Implement the feature logic/validation rules step-by-step.
4. Ensure code conforms to codebase patterns (lints, formats, types).

Verification & Testing Requirements

• Validation check: Verify retry frequency increases up to max attempts on connection dropouts.
• Add comprehensive test cases matching these validation requirements.
• Ensure all other existing project tests continue to compile and pass.

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Note: This issue is completely self-contained and does not block or require any other issues to be resolved.

[Akinloluwa20]

@Akinloluwa20 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I would like to work on this issue

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[zakarimaureen1-blip]

@zakarimaureen1-blip has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi please assign to me

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[Awosdot]

@Awosdot has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Please assign this to me

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This issue has been completed by @zakarimaureen1-blip as part of the Stellar Wave Program's 8th Wave 🥳

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