pacman-key: --refresh-keys queries WKD before keyserver

With the recent outages of the keyservers there is a possibility of
`--refresh-keys` failing to fetch new keys. A lot of current key
distribution is done over WKD these days, and `pacman-key` has the
ability to use it for `--recv-key`.

There was a hope `gpg` would end up supporting WKD for the refresh
functionality, but this seems to be limited to expired keys fetched
through WKD. Since this functionality isn't yet available it makes sense
to stuff it into `pacman-key`.

The current implementation looks over all available keyids in the
keyring, attempts to fetch over WKD and then fall backs to keyservers if
no email has a valid WKD available. The downside of this approach is
that it takes a bit longer to refresh the keys, but it should be more
robust as the distribution should be providing their own WKDs.

Co-authored-by: Jonas Witschel <diabonas@archlinux.org>
Signed-off-by: Morten Linderud <morten@linderud.pw>
Signed-off-by: Allan McRae <allan@archlinux.org>

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