Add events package

The @openrpc/client-js library has a bug[1] and this package needs to be
added to make it work. I don't fully understand the details :(

This package is a dependency of codemirror-languageserver and other
people seem to have the same issue[2].

[1]: open-rpc/client-js#310
[2]: FurqanSoftware/codemirror-languageserver#26

editor/package.json

@@ -43,6 +43,7 @@
     "@codemirror/view": "^6.23.1",
     "@lezer/highlight": "^1.2.0",
     "@lezer/lr": "^1.4.0",
-    "codemirror-languageserver": "^1.11.0"
+    "codemirror-languageserver": "^1.11.0",
+    "events": "^3.3.0"
   }
 }