Expose log level for default logger and provide helper methods

[jeevatkm]

Goal is to expose log level from log library.

Expose log level for default logger, since logger already does it - Refer here

log.Level()

and provide helper methods. It would be helpful for user to check before doing log (it contributes to performance).

• log.IsLevelInfo()
• log.IsLevelError()
• log.IsLevelWarn()
• log.IsLevelDebug()
• log.IsLevelTrace()

[jeevatkm]

It's done.