Support Netty

It would be nice if the web package had interceptors for [Netty](https://netty.io/) servers, since Netty doesn't use Servlets. The interceptor should publish request/response events with similar information to their Servlet counterparts. Can't see from a quick skim of the [docs](https://netty.io/3.7/guide/) that netty has built-in hooks to intercept requests, so some ByteBuddy action will probably be needed.

The issue names no files or tests; start by locating the web package's Servlet interceptor and reviewing the linked Netty documentation. Compare the Servlet request/response event information with Netty's available hooks, then define the ByteBuddy-based interception scope. Done means Netty servers publish equivalent request and response events.

Written by the indexing model from the issue text.