chore(events): apply post-merge comments

Introduces a new interface `RequestDetails` to abstract `Request`
providing access to request body and headers.

**BREAKING:** Replace `request: Request` with `request: RequestDetails` at `RequestValidator`.

**BREAKING:** Remove required field `router` at `HttpPostIngressEventPublisher.fromConfig`
  and replace it with `bind(router: Router)`.
  Additionally, the path prefix `/http` will be added inside `HttpPostIngressEventPublisher`.

Relates-to: PR #13931
Signed-off-by: Patrick Jungermann <Patrick.Jungermann@gmail.com>

plugins/events-backend/README.md

@@ -170,8 +170,8 @@ const http = HttpPostIngressEventPublisher.fromConfig({
     },
   },
   logger: env.logger,
-  router: httpRouter,
 });
+http.bind(router);
 
 await new EventsBackend(env.logger)
   .addPublishers(http)