[Feature] - Support vertx http server for closing of the handlers

#### Describe the feature

We should support checking if handler(s) in the HTTP server are Vertx Closeable (Java Closeable as well?) and close them in the shutdown sequence.

#### Use cases

For now, the main use case would be in GrpcServer in vertx-grpc, which is basically a handler, as we would like to support the Service interface to be Closeable.