AUTHORS: update with missing names

This is generated by scripts/update_authors.pl. I've looked over the
results fairly closely and while I don't think they're bad, they could
be improved somewhat, but also, I don't know if its good form to just
update this without explicit consent from those named.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Tino Reichardt <[email protected]>
Signed-off-by: Rob Norris <[email protected]>
Closes openzfs#15374