Add support for Scrapy 2.14 download handler API. #357
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For scrapy/scrapy#7164
This is kind of a proof of concept, but it passes tests on Linux both in this state (so using Scrapy 2.13) and with modifications for the unreleased Scrapy (installing Scrapy from the branch, changing _ASYNC_HANDLER_API to True).
I haven't tested this on Windows, but I kept
_deferred_from_coro()calls, so it should work (as an aside, with almost all Scrapy API preferring coroutines now, it would be easier to not have these calls and double conversions, maybe_ThreadedLoopAdaptercan be extended to also take coros directly).