`hattip-ws/uwebsockets` does not forward Hattip context to connected peers

I ran out of time to implement this, but if anyone's interested in contributing, take a look at how it's done in the `hattip-ws/node` adapter. The difficulty is that UWS (like Node) doesn't handle upgrade requests in a normal request handler, instead opting for a special, out-of-line handler. Also, unlike with Deno/Bun/Cloudflare, `crossws` wraps the UWS/Node request in a "proxy" object (presumedly for normalization), so the call to `forwardHattipContext` is less straight-forward.

Here's the `hattip-ws/node` implementation:

https://github.com/alloc/hattip-ws/blob/ef25ef7110ee2e5daf2f27496380348a70fc5f8e/src/adapters/node/node.ts#L41-L78