[Javascript] Add pogo

[waghanza]

Hi @sholladay,

I think it could be a good idea to introduce pogo here.

Is this something okay for you ?

Regrads,

[sholladay]

Yeah, that's fine. Thanks for asking.

I am working on updating the framework to make use of Deno's newer HTTP APIs, which should improve performance. No need to wait, though. I don't have a timeline for when that version will be ready. And from what I can tell looking at the implementation of these benchmarks, none of the breaking changes will apply here.