Add tokio-uring benchmark

[matze]

This adds a sample server using the tokio-uring 0.3 TCP streams. Note that tokio-uring only supports a single-threaded run-time, so …

[lizhanhui]

Note that tokio-uring only supports a single-threaded run-time

With due respect, this statement is not true to my knowledge.

[matze]

I opened this PR nice months ago …

[ihciah]

I opened this PR nice months ago …

I'm sorry I didn’t noticed this PR. We’ll process it tomorrow.

[matze]

Don't worry, I was just trying to express that things changed on tokio-uring's side.

[lizhanhui]

Don't worry, I was just trying to express that things changed on tokio-uring's side.

Yes, tokio-uring is still in its early stage with significant changes undergoing...things could have changed a lot

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