Add supporting Weights for registration service

[nicholasgribanov]

Needed to extend registration options to be able to send weights in time of register service
here description and structure for Weights https://www.consul.io/api-docs/agent/service#weights
Part of payload:

"Weights": {
    "Passing": 10,
    "Warning": 1
  }

[nicholasgribanov]

#28 PR here