stats server cleanup and minor fixes

- moved to io.takari namespace
- use http put to match aether okhttp connector behaviour
- accept and log message body as-is

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
java service wrapper and server packaging

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
moved everything back to single module

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>