refactor/declare command option types

util/CommandOptionTypes.js

@@ -0,0 +1,15 @@
+module.exports = {
+  CommandOptionTypes: {
+    SubCommand: 1,
+    SubCommandGroup: 2,
+    String: 3,
+    Integer: 4,
+    Boolean: 5,
+    User: 6,
+    Channel: 7,
+    Role: 8,
+    Mentionable: 9,
+    Float: 10, // AKA Number in Discord's Documentation
+    Attachment: 11,
+  }
+};