Port the 0.14 hyper client to hyper-util #3147
Description
While we'll eventually want to decompose the various pieces, as described in #3080, at least start by just porting over the pooling Client, so people can start using it now.
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While we'll eventually want to decompose the various pieces, as described in #3080, at least start by just porting over the pooling Client, so people can start using it now.