Build a list of native or Polka-compatible middleware

Nobody has claimed this yet.

Pretty much what it says on the title. It would be awesome to know which middlewares are compatible with Polka or made exclusively with Polka in mind.

So far I haven't found any, but maybe some middleware can break while running on Polka because [it uses IncomingMessage and ServerResponse](https://github.com/lukeed/polka#handlers) while Express uses their own implementation of a [request module](https://github.com/expressjs/express/blob/master/lib/request.js) and a [response module](https://github.com/expressjs/express/blob/master/lib/response.js).

If deemed unnecessary, the issue can be closed. But for now, here are the lists:

### Native to Polka

- sirv

### Compatible, tested by the creator

- body-parser
- cors
- compression
- morgan
- sapper
- serve-static

### Compatible, tested by users

- express-fileupload
- helmet
- http-proxy-middleware
- response-time
- favicon

### Incompatible

- Nothing so far

Start with Polka's linked handlers documentation and compare its IncomingMessage/ServerResponse contract with Express's linked request and response modules. Verify the middleware listed in the issue, then document accurate native, compatible, and incompatible categories; done means the list is supported by compatibility checks.

Written by the indexing model from the issue text.