supabase / supabase-swift / 16605636117

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feat(realtime): subscribe retry improvements (#747)

* feat(realtime): add retry limit to subscribe

* feat(realtime): add exponential backoff with jitter and cancellation support

* use Encodable type for broadcast

* fix tests

* test: revamp realtime tests

* remove redundant test case

* fix(realtime): fix subscription retry logic and test failures

- Add missing return statement in subscribeWithError() to prevent infinite retries
- Add heartbeat response handling in testBehavior test
- Fix test expectations for retry attempts
- Ensure proper cleanup on subscription failure

This fixes the issue where successful subscriptions would continue retrying
and tests would fail due to incorrect retry attempt counting.

* add configurable option for maxRetryAttempts

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