dio_essentials: four Dio interceptors for dedup, retry, token refresh and logging

<p>Many apps that use Dio end up with the same four interceptors. One retries failed requests. One attaches the access token and refreshes it on a <code>401</code>. One logs. And at some point someone adds a fourth to stop the same <code>GET</code> from firing three times when three widgets build together.</p> <p>They are usually written by hand, in a hurry, and they tend to have the same bugs. Th

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