chore(feat): add middleware decorator and change validator trait

[ikr4-m]

• Changing Validator trait as Middleware because it's the same behind the scenes.
• Casting all Promise<void> as MiddlewareHandler on Reflect because it is using the same traits as MiddlewareHandler. The function that using return Promise<void> on handler is for middleware that have next keyword.
• Implementing and giving example how to use the decorator on HelloController.

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[Hazmi35]

LGTM