feat(xan): Use haskell-language-server

Use haskell-language-server instead of haskell-ide-engine for Xanthous.

Change-Id: I7ef1433d5cd561e659fc06b3f373a6f29dfa5690
Reviewed-on: https://cl.tvl.fyi/c/depot/+/904
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: BuildkiteCI

users/glittershark/xanthous/package.yaml

@@ -31,6 +31,7 @@ dependencies:
 - comonad-extras
 - constraints
 - containers
+- criterion
 - data-default
 - deepseq
 - directory