Replacement for Spring Retry's `RetryContext` and `RetrySynchronizationManager`

[kzander91]

For code that needs to be aware about the number of attempts, or that needs to keep information between individual attempts within a retryable invocation, Spring Retry had the RetryContext abstraction, that was given as an argument to the callback invoked by RetryTemplate, and was statically accessible through RetrySynchronizationManager from within code marked with @Retryable.

No replacement for this seems to exist in Framework's support and implementing this myself isn't straightforward in all cases.
Please consider adding this functionality back.