fix: improve speed of Files.walk()
#466
Merged
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Issue #, if available:
#458
Description of changes:
caches results of expensive calls to determine the bucket region and caches clients for buckets to reduce the large expense of creating a client. Clients are meant to be re-used according to SDK docs and are thread safe. Because clients can be "auto-closed", Cached clients are wrapped so that their "closed" status can be recorded and queried. Generally clients should not be closed unless you know you will no longer need them (due to the cost of creating them).
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