Support for AsyncIterators

[metcoder95]

After seeing the following comment from @JoshuaWise: #108 (comment)

I started wondering if adding support for AsyncIterators might be a good addition. But somehow I feel it might break the pillars behind Piscina, as each thread communicates back an Iterator and that might cause some harm over the whole pool (not to mention possible leakages).

Wanted to drag some chat about it and maybe start thinking about its pros and cons.

[metcoder95]

cc: @RafaelGSS @ronag @mcollina @jasnell

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