Support new std/http API

[v1rtl]

Ref: https://deno.land/std@0.108.0/http

[zhmushan]

Thank you for your interest in Abc!

This is a relatively big change for me, and I will take this opportunity to redesign part of the API and release v2. The new version is expected to be released by Oct. 10

[v1rtl]

ok sounds good

[zhmushan]

We can now experience abc@v2 with the following code, but the current guide is still outdated.

import { Application } from "https://raw.githubusercontent.com/zhmushan/abc/v2/mod.ts";