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

src/plex/plexRepository.js

@@ -1,5 +1,5 @@
-const convertPlexToSeasoned = require("./convertPlexToSeasoned");
-const convertPlexToStream = require("./convertPlexToStream");
+import convertPlexToSeasoned from "./convertPlexToSeasoned.js";
+import convertPlexToStream from "./convertPlexToStream.js";
 
 // eslint-disable-next-line
 function addAttributeIfTmdbInPlex(_tmdb, plexResult) {
@@ -103,4 +103,4 @@ class PlexRepository {
   // }
 }
 
-module.exports = PlexRepository;
+export default PlexRepository;