[nix] move corenlp to separate flake in core-nix repo

#483
5 jobs for 483-dev-corenlp-in-nix-flake in 27 minutes and 57 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Cabal
passed #18634
cabal

00:14:00

 
  Stack
passed #18635
stack

00:02:07

 
  Bench
manual #18636
allowed to fail manual
bench
 
  Test
canceled #18642
test

00:11:50

failed #18637
test

00:20:15