add haskell language server

Author: soulomoon

bench/config.yaml

@@ -79,15 +79,12 @@ examples:
 
   # Small but heavily multi-component example
   # Disabled as it is far to slow. hie-bios >0.7.2 should help
-  # - name: HLS
-  #   path: bench/example/HLS
-  #   modules:
-  #       - hls-plugin-api/src/Ide/Plugin/Config.hs
-  #       - ghcide/src/Development/IDE/Plugin/CodeAction/ExactPrint.hs
-  #       - ghcide/bench/hist/Main.hs
-  #       - ghcide/bench/lib/Experiments/Types.hs
-  #       - ghcide/test/exe/Main.hs
-  #       - exe/Plugins.hs
+  - name: haskell-language-server
+    version: 2.9.0.0
+    modules:
+          - ghcide/session-loader/Development/IDE/Session.hs
+          - ghcide/src/Development/IDE.hs
+          - plugins/hls-semantic-tokens-plugin/src/Ide/Plugin/SemanticTokens.hs
 
 # The set of experiments to execute
 experiments: