Switch to vertx-grpc-client

[lburgazzoli]

As today, the vertx-grpc library is still based on grpc-java which has a number of issues and given the time I have to maintain the project, it make maintenance harder hence, given the project is already vert.x based, wet should switch to the vert.x grpc client

• https://github.com/etcd-io/jetcd/issues/1370
• https://vertx.io/docs/vertx-grpc/java/#_vert_x_grpc_client
• https://github.com/eclipse-vertx/vertx-service-resolver
• https://github.com/eclipse-vertx/vertx-grpc/issues/100
• https://github.com/eclipse-vertx/vert.x/blob/master/src/main/java/examples/HTTPExamples.java#L1405
• https://github.com/eclipse-vertx/vertx-grpc/blob/main/vertx-grpc-client/src/main/java/io/vertx/grpc/client/GrpcClient.java#L95