Implement `urllib.request.Request` compatible API for auth.

Ben Finneyrequested to merge
wip/issue/944194/http-auth-request-error-handler into main

The AuthHandlerHackAround implements a fake urllib.request.Request, but is missing some properties used in recent Python versions. (See Debian bug#944194)

These changes add full_url (a data property) and get_header (a method property) to AuthHandlerHackAround instances.

Edited by Ben Finney

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