GODT-1816: Connect Gluon Logs to bridge Logs

Ensure the IMAP commands and SMTP commands are logged to trace channels
with an entry so they are recognizable as before.

internal/logging/smtp_logger.go

@@ -0,0 +1,35 @@
+package logging
+
+import (
+	"github.com/sirupsen/logrus"
+)
+
+// SMTPErrorLogger implements go-smtp/logger interface.
+type SMTPErrorLogger struct {
+	l *logrus.Entry
+}
+
+func NewSMTPLogger() *SMTPErrorLogger {
+	return &SMTPErrorLogger{l: logrus.WithField("pkg", "SMTP")}
+}
+
+func (s *SMTPErrorLogger) Printf(format string, args ...interface{}) {
+	s.l.Errorf(format, args...)
+}
+
+func (s *SMTPErrorLogger) Println(args ...interface{}) {
+	s.l.Errorln(args...)
+}
+
+// SMTPDebugLogger implements the writer interface for debug SMTP logs
+type SMTPDebugLogger struct {
+	l *logrus.Entry
+}
+
+func NewSMTPDebugLogger() *SMTPDebugLogger {
+	return &SMTPDebugLogger{l: logrus.WithField("pkg", "SMTP")}
+}
+
+func (l *SMTPDebugLogger) Write(p []byte) (n int, err error) {
+	return l.l.WriterLevel(logrus.TraceLevel).Write(p)
+}