http utils: push custom thread local main context

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We're calling async soup APIs with SOUP_SESSION_USE_THREAD_CONTEXT
set, which means that libsoup async APIs will run async callbacks on
the loop of the thread-default main context. We then manually spin
this main context, because we're supposed to look like a sync call and
the async stuff is just internally.

This is not really right, because normally there isn't any custom
mainloop context registred, which means we're spinning the main thread
context on some other thread, as well as queuing soup sorces on
it. This can't be any good!

Rather than doing this we actually create and push our own main
context that we then spin isolated from the default mainloop.

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