Explain Koa.js context (ctx) object.
In Koa.js, the context object, commonly referred to as ctx, plays a central role in encapsulating information related to the current request and response within the middleware flow.
The ctx object provides a unified interface, allowing developers to interact with both the incoming request and the outgoing response.
It is passed as the first parameter to all middleware functions and encapsulates various properties and methods that facilitate working with the HTTP request-response lifecycle.
