enable caching at the top level DefaultAzureCredential #1491
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Right now, the underlying layers exposed by DefaultAzureCredential include caching. However, in common use, if the user is using az-cli, it will require environment credential/IMDS to fail for every request before moving onto az-cli.
By caching at the DefaultAzureCredential layer and the underlying layer, most repeated calls will hit the first layer cache quickly.