Add routes subcommand to CLI

It integrates servant-routes which allows to list and export the
server backend routes.
4 jobs for adinapoli/issue-350 in 34 minutes and 36 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Cabal
passed #13844
cabal

00:12:09

 
  Stack
passed #13845
stack

00:06:57

 
  Bench
manual #13846
allowed to fail manual
bench
 
  Test
passed #13847
test

00:15:29