Added alias, name, helpCommands and loadFile (#25012)

* Added some extra defintions

- Alias and name can be used to identify the name of the bot.
- helpCommands will list all help commands
- loadFile will load a script file from a directory into the bot

* Update index.d.ts

* Making CLI happy.

types/hubot/index.d.ts

@@ -1,6 +1,7 @@
 // Type definitions for hubot 2.19
 // Project: https://github.com/github/hubot
 // Definitions by: Dirk Gadsden <https://github.com/dirk>
+//                 Kees C. Bakker <https://github.com/KeesCBakker>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 declare namespace Hubot {
@@ -33,12 +34,16 @@ declare namespace Hubot {
     type ListenerCallback<R> = (response: Response<R>) => void;
 
     class Robot<A> {
+        alias: string;
         brain: Brain;
+        name: string;
         readonly adapter: A;
 
         constructor(adapterPath: string, adapter: string, httpd: boolean, name: string, alias?: string);
         hear(regex: RegExp, callback: ListenerCallback<this>): void;
         hear(regex: RegExp, options: any, callback: ListenerCallback<this>): void;
+        helpCommands(): string[];
+        loadFile(directory: string, fileName: string): void;
         respond(regex: RegExp, callback: ListenerCallback<this>): void;
         respond(regex: RegExp, options: any, callback: ListenerCallback<this>): void;
     }