feat(handler): Use Koa

[enisdenjo]

Closes #78

Server usage with Koa

import Koa from 'koa'; // yarn add koa
import mount from 'koa-mount'; // yarn add koa-mount
import { createHandler } from 'graphql-sse/lib/use/koa';
import { schema } from './my-graphql';

// Create a Koa app
const app = new Koa();

// Serve all methods on `/graphql/stream`
app.use(mount('/graphql/stream', createHandler({ schema })));

app.listen({ port: 4000 });
console.log('Listening to port 4000');

[github-actions]

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[enisdenjo]

🎉 This PR is included in version 2.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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