Added several improvements to Metrics configuration

- Updated metrics version to 3.1.0
- Added sending through UDP
- Added sending through TCP using pickle format
- Added jvm metrics
- Added env property for enabling graphite sender (graphite.enabled) on dev profile
- Removed prefix prepending and configured prefix on graphite sender.
See https://github.com/4finance/micro-infra-spring/commit/f260183bf404371d78cf745efffc03fd7a91de9e - we don't need to store all these fields.