Implement Complex.cis
Implement Complex.cis

Fixes hang[^1] with i.cis, but I see more candidates in Real that
go through Cool that hang (e.g. unpolar). Need to figure out which
can be handled by Complex and implement those, and those that don't
need to coerce to .Real, not .Numeric, in Cool candidates.

https://irclog.perlgeek.de/perl6/2017-06-07#i_14699844

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