Add the ability for cancel scopes to specify a grace period#921
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Fixes #147.
I know there's still some debate in #147 about what form this should take, but I wanted to provide an example of what "Type 2" graceful cancellation might look like. I'm open to suggestions on the names.
(You can implement "Type 1" easily in terms of "Type 2"; just write
with trio.shield_during_cleanup():around each request. It probably wants a different name in that case, though.)