Better JS language integration for Pre-Request scripts and Test scripts (#1422)

* Add tern as dependency

* Add build rule to transpile mjs

* Initial implementation of the auto complete engine

* Separate out the tern server code to separate file

* Added extra type defs for tern server

* Boost the pw completion result to the top of the list

* Added acorn and acorn-walk as dependency

* Semantic linting powered by tern

* Fix DeepCode warnings for js-editor

* Remove unused registerLint tern extension

Co-authored-by: Liyas Thomas <liyascthomas@gmail.com>

pages/index.vue

@@ -507,6 +507,7 @@
                         useWorker: false,
                       }"
                       styles="rounded-b-lg"
+                      completeMode="pre"
                     />
                   </li>
                 </ul>
@@ -548,6 +549,7 @@
                         useWorker: false,
                       }"
                       styles="rounded-b-lg"
+                      completeMode="test"
                     />
                     <div v-if="testReports.length !== 0">
                       <div class="row-wrapper">