Leverage ext-curl when possible to achieve high speed downloads #286
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This PR brings hirak/prestissimo-like download performance to Flex, but with greater compatibility with Composer's native behavior, thanks to a new extension point that is going to be part of Composer 1.7 (composer/composer#6985).
Meanwhile, it already provides concurrent connections, and auto-enables the curl-based downloader conditionally.
In short, it should be totally seamless.