Feat/create minute exponential backoff

[asalsys]

Explanation

This PR pushes for a retry to be called an exponential backoff by the minute. The remote feature flag controller will automatically: Make an initial API request If it fails, wait 1 minute and retry If that fails, wait 2 minutes and retry If that fails, wait 4 minutes and retry After 3 failed retries (4 total attempts), the circuit breaker will prevent further attempts for a period.

References

Checklist

• [X] I've updated the test suite for new or updated code as appropriate
• [X] I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• [X I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• [X] I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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[!NOTE] Adds optional per-retry custom backoff intervals to ClientConfigApiService with validation and tests; defaults to exponential backoff when not provided.

• ClientConfig API Service (src/client-config-api-service/client-config-api-service.ts)
  • Add optional customBackoffInterval (seconds) to constructor for precise per-retry delays.
  • Implement CustomIntervalBackoff and integrate via createServicePolicy({ backoff }).
  • Validate intervals (non-empty, positive numbers, length equals retries); throw descriptive errors.
  • Default to ExponentialBackoff when no custom intervals are provided.
  • Minor: make several private fields readonly; JSDoc improvements.
• Tests (client-config-api-service.test.ts)
  • Add coverage for custom intervals usage, validation errors, and fallback to exponential backoff.
  • Utility createMockFetch defaults and behavior adjusted for tests.
• Controller (src/remote-feature-flag-controller.ts)
  • Minor: mark fields readonly; comment cleanups.
• Changelog
  • Document custom backoff interval support and defaults.

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