feat: support adding more writer, easy to write to console additionally (#4234)

Signed-off-by: kevin <wanjunfeng@gmail.com>

core/logx/logs_test.go

@@ -679,6 +679,10 @@ func TestSetup(t *testing.T) {
 
 func TestDisable(t *testing.T) {
 	Disable()
+	defer func() {
+		SetLevel(InfoLevel)
+		atomic.StoreUint32(&encoding, jsonEncodingType)
+	}()
 
 	var opt logOptions
 	WithKeepDays(1)(&opt)
@@ -701,6 +705,17 @@ func TestDisableStat(t *testing.T) {
 	assert.Equal(t, 0, w.builder.Len())
 }
 
+func TestAddWriter(t *testing.T) {
+	const message = "hello there"
+	w := new(mockWriter)
+	AddWriter(w)
+	w1 := new(mockWriter)
+	AddWriter(w1)
+	Error(message)
+	assert.Contains(t, w.String(), message)
+	assert.Contains(t, w1.String(), message)
+}
+
 func TestSetWriter(t *testing.T) {
 	atomic.StoreUint32(&logLevel, 0)
 	Reset()