Feat: es modules (#139)

* All file imports change from commonjs to es-module

* Improved plex error responses back from api

* Converted viewHistory to es module

* Es-module requires file extension, updated all imports

* Fix esmodule not having __dirname defined in scope

* Replace dynamic-require with fs readFileSync

* Short message service module function is exported as default

* Resolved lint issues & ignore import/extension rule until typescript

* All tests file imports changed from commonjs to es-module

* Import json fixtures with new helper

tests/helpers/resetDatabase.js

@@ -10,13 +10,11 @@
 //   }
 // }
 
-const establishedDatabase = require("../../src/database/database");
+import establishedDatabase from "../../src/database/database.js";
 // const establishedDatabase = new EstablishedDatabase();
 
-function resetDatabase() {
+export default function resetDatabase() {
   return Promise.resolve()
     .then(() => establishedDatabase.tearDown())
     .then(() => establishedDatabase.setUp());
 }
-
-module.exports = resetDatabase;