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/createCacheEntry.js

@@ -1,7 +1,5 @@
-const redisCache = require("../../src/cache/redis");
+import redisCache from "../../src/cache/redis.js";
 
-function createCacheEntry(key, value) {
+export default function createCacheEntry(key, value) {
   return redisCache.set(key, value);
 }
-
-module.exports = createCacheEntry;