logger

type LogFields map[string]interface{}

type LogFn = func(message string)

type LogLevel int8

type LogfFn = func(format string, values ...interface{})

type Logger interface {
	SetLogLevel(level LogLevel)
	GetLogLevel() LogLevel

	Panic(message string)
	Panicf(format string, values ...interface{})
	Error(message string)
	Errorf(format string, values ...interface{})
	Info(message string)
	Infof(format string, values ...interface{})
	Debug(message string)
	Debugf(format string, values ...interface{})

	WithInterface(key string, value interface{}) Logger
	WithFields(fields LogFields) Logger
}