Standardize Middlewares

[Guergeiro]

Summary

What: Make server level middleware accept functions and drop current implementation.

Why: Keeping a standard for all middlewares (see #186).

Acceptance Criteria

• Implement functionality for server handling
• Make it asynchronous
• Update tests (if necessary)

Example Pseudo Code (for implementation)

// ---------- Previous
class ServerMiddleware extends Drash.Http.Middleware {
    public run() {
        console.log(`server middleware with ${this.request}${this.response}`);
    }
}
const server = new Drash.Http.Server({
    resources: [HomeResource],
    middleware: {
        before_request: [ServerMiddleware],
        after_request: [ServerMiddleware]
    }
});

// ---------- Feature
function SyncServerMiddleware(req: any, response: Drash.Http.Response) {
    console.log(`server middleware with ${request}${response}`);
}
async function AsyncServerMiddleware(req: any, response: Drash.Http.Response) {
    console.log(`server middleware with ${request}${response}`);
}
const server = new Drash.Http.Server({
    resources: [HomeResource],
    middleware: {
        before_request: [SyncServerMiddleware],
        after_request: [AsyncServerMiddleware]
    }
});