databases/couchdb3: new port from databases/couchdb2
- upstream supports both 2.x and 3.x series
- this will also support any platform that has a functioning SpiderMonkey 60 port as well as Erlang/OTP, such as armv8 & ppc64
Sponsored by: SkunkWerks, GmbH
Differential Revision: https://reviews.freebsd.org/D24616