GrpcClient builder should expose the connection handler

### Describe the feature

The GrpcClient should have a companion builder, like in the case of the HttpClient: https://github.com/eclipse-vertx/vert.x/blob/4.5.25/src/main/java/io/vertx/core/http/HttpClientBuilder.java

This would allow access to the `withConnectHandler` and provide a way to customize, among other things, the `exceptionHandler`.

See this Quarkus PR for an example: https://github.com/quarkusio/quarkus/pull/52782

### Contribution

_No response_