[fix] prefetch s3 credentials #94
Draft
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Prefetch S3 credentials to resolve errors emanating from earthaccess.Auth.get_s3_credentials in multithreaded contexts.
Resolves #92
Putting in draft state in case we decide to go with the simpler, but probably slower, credential lock option. In other words, continue to fetch S3 credentials in threads but using a credential lock.
This option seems preferable if we are not concerned about combining assets from multiple providers.