provide ability to request a fresh connection

Is your feature request related to a problem? Please describe.
Certain retry behaviors specify a fresh connection (and sometimes a full DNS re-lookup) to direct traffic away from what might be a problematic host. I need the ability to somehow mark a request to Hyper as not reusing a connection that may be in the pool

Describe the solution you'd like
I can imagine a few ways the API might be structured, but in general I'd like some way as marking a request as "needs fresh connection", potentially giving a reference to the old connection / response which was problematic.

Describe alternatives you've considered
I could rebuild the entire client & pool when a request fails in a way that necessitates a re-lookup. However, it seems like that may cause unnecessary churn on the client side.

Additional context
https://docs.aws.amazon.com/AmazonS3/latest/userguide/optimizing-performance-design-patterns.html#optimizing-performance-timeouts-retries

Begin with Hyper's client and connection-pool behavior around request retries and connection reuse. Determine the API requirements for marking a request as needing a fresh connection, including whether an earlier connection or response can be referenced, and define observable behavior for connection reuse and DNS re-lookup. No file or test is named in the issue.