feat: introduce a memory for retry::Policy #599
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Description
The idea introduced, here, is to add a "memory" parameter for the retry policy. If a long-running retryable operation (like chainsync) fails sporadically then the downstream oura user may not actually want the retry counter to increment. By default, the memory should be longer than the longest possible delay. If this isn't done then max_retries will never be encountered and retry_operation will never return. This case (never returning) may be desirable in some cases (like for a daemon application). But, it should not be the default case.