Add Logging via Zap Logger

[uzaxirr]

Is your feature request related to a problem? Please describe. Currently we use the traditional golang log package for logging purpose, however its not sufficient as it lacks a lot of basic functionality like an error level log.

Describe the solution you'd like Use Zap Logger and replace all the occurrence of log package with this one. Also add new logger statements whenever necessary.

Describe alternatives you've considered logrus