feat(): add middleware support & refactor

sample/app.module.ts

@@ -3,11 +3,13 @@ import { TelegrafModule } from '../lib';
 import { EchoService } from './echo.service';
 import { AppUpdate } from './app.update';
 import { HelloScene } from './scenes/hello.scene';
+import { sessionMiddleware } from './middleware/session.middleware';
 
 @Module({
   imports: [
     TelegrafModule.forRoot({
       token: '1467731595:AAHCvH65H9VQYKF9jE-E8c2rXsQBVAYseg8', // Don't steal >:(
+      middlewares: [sessionMiddleware],
     }),
   ],
   providers: [EchoService, AppUpdate, HelloScene],

sample/middleware/session.middleware.ts

@@ -0,0 +1,3 @@
+import { session } from 'telegraf';
+
+export const sessionMiddleware = session();

sample/scenes/hello.scene.ts

@@ -11,7 +11,7 @@ export class HelloScene {
   }
 
   @SceneLeave()
-  async onSceneLeave(): Promise<void> {
+  async onSceneLeave(ctx: Context): Promise<void> {
     console.log('Leave from scene');
     await ctx.reply('Bye Bye 👋');
   }