fix(middleware-retry): defaultStrategy handles any error #2349
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Resolves #2292
The lower level stacks than throw anything to retry strategy in
practice, so casting them to SdkError type is unsafe. With this
change the retryStrategy will do best effort to convert the
thrown any object to SdkError and then supply to retryDecider
and so on.
Another change is making SdkError type more general. It previously
requires $fault, $metadata, which is obviously incorrect. Error
thrown by SDK itself never contains these keys. So I mark them
optional. Granted this is a breaking change to function interface
like RetryDecider, but anyone depending it being required should
already fail anyway.
/cc @just-boris
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