Vert.x Web Client & Server code generator

[slinkydeveloper]

Description

Code generator both for client and server with Eclipse Vert.x

Client codegen will be Vert.x generic, supporting Java, Java with RxJava 2 & Kotlin for now. It will have a @Vertx interface as entrypoint

Server codegen will be for Java (for now)

I'm working on it

[wing328]

@lwlee2608 has contributed a server generator for Vert.x Web.