Copies type definitions from `@types/express-ws`. Also adapts them and
re-exports `addWsMethod()`, which we [need access to downstream][1].

[1]: https://github.com/reedsy/express-controller/blob/8b537f2d3a91ac30368143e4e3a4398de0bacf6d/src/express/express-controller.ts#L37-L39