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

[zZHorizonZz]

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.