fix(httpclient-vertx-5): rename package to prevent classpath conflict
Rename package from io.fabric8.kubernetes.client.vertx to
io.fabric8.kubernetes.client.vertx5 and prefix all classes with Vertx5
to prevent classpath conflicts when both httpclient-vertx (Vert.x 4) and
httpclient-vertx-5 (Vert.x 5) JARs are present.
This resolves NoClassDefFoundError and split-package warnings that
occurred because both modules previously used identical package and
class names.
Fixes #7437
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>