Fixes #2153: Add a dispose() method to the code lens provider

test/playground.generated/extending-language-services-codelens-provider-example.html

@@ -63,7 +63,8 @@ monaco.languages.registerCodeLensProvider('json', {
                         title: "First Line"
                     }
                 }
-            ]
+            ],
+            dispose: () => {}
         };
     },
     resolveCodeLens: function (model, codeLens, token) {

website/playground/new-samples/extending-language-services/codelens-provider-example/sample.js

@@ -26,7 +26,8 @@ monaco.languages.registerCodeLensProvider('json', {
                         title: "First Line"
                     }
                 }
-            ]
+            ],
+            dispose: () => {}
         };
     },
     resolveCodeLens: function (model, codeLens, token) {