feat(logging): add GCP severity mapping

pkg/modules/logging/color.go

@@ -0,0 +1,49 @@
+package logging
+
+import (
+	"fmt"
+
+	"go.uber.org/zap/zapcore"
+)
+
+// Foreground colors.
+// Copy pasted from go.uber.org/zap/internal/color/color.go
+const (
+	black color = iota + 30
+	red
+	green
+	yellow
+	blue
+	magenta
+	cyan
+	white
+)
+
+type color uint8
+
+func (c color) Add(s string) string {
+	return fmt.Sprintf("\x1b[%dm%s\x1b[0m", uint8(c), s)
+}
+
+func levelToColor(l zapcore.Level) color {
+	switch l {
+	case zapcore.DebugLevel:
+		return cyan
+	case zapcore.InfoLevel:
+		return blue
+	case zapcore.WarnLevel:
+		return yellow
+	case zapcore.ErrorLevel:
+		return red
+	case zapcore.DPanicLevel:
+		return red
+	case zapcore.PanicLevel:
+		return red
+	case zapcore.FatalLevel:
+		return red
+	case zapcore.InvalidLevel:
+		return red
+	default:
+		return red
+	}
+}