Set up Windows CI

Get rid of the -vvv and give the steps better names

They have no metadata.  They lose information about extras.  They break installation.

So it doesn't squash a failure result from the test suite

no way this works ...

Make the default profile disable too_slow and the deadline

That is, dumping any extra information from Hypothesis clutters up the test
runner output too much to leave this on in general. :(

Better misconfiguration failure

Enforce model constraints around the opaque PrivacyPass strings

each, 88 bytes of base64