Initialize unit testing and code coverage

* add: vitest configs

* added vitest scripts to package

* test coverage of src code

* initial unit testing

* added new testing workflows

* comments added, overlapping tests removed

* decouple env, tests

---------

Co-authored-by: Kevin Dang <kevinthedang_1@outlook.com>

tests/events.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, it } from 'vitest'
+import events from '../src/events'
+
+/**
+ * Events test suite, tests the events object
+ * Each event is to be tested elsewhere, this file
+ * is to ensure that the events object is defined.
+ * 
+ * @param name name of the test suite
+ * @param fn function holding tests to run
+ */
+describe('#events', () => {
+    // test definition of events object
+    it('references defined object', () => {
+        expect(typeof events).toBe('object')
+    })
+
+    // test specific events in the object
+    it('references specific events', () => {
+        const eventsString = events.map(e => e.key.toString()).join(', ')
+        expect(eventsString).toBe('ready, messageCreate, interactionCreate')
+    })
+})