Add haskell.plugin.fourmolu.config.path option (#987)

Author: georgefst

package.json

@@ -299,6 +299,12 @@
           "scope": "resource",
           "type": "boolean"
         },
+        "haskell.plugin.fourmolu.config.path": {
+          "default": "fourmolu",
+          "markdownDescription": "Set path to executable (for \"external\" mode)",
+          "scope": "resource",
+          "type": "string"
+        },
         "haskell.plugin.gadt.globalOn": {
           "default": true,
           "description": "Enables gadt plugin",