k8s.io/component-base/logs: replace klog text implementation

This replaces the klog formatting and message routing with a simpler
implementation that uses less code. The main difference is that we skip the
entire unused message routing.

Instead, the same split output streams as for JSON gets implemented in the
io.Writer implementation that gets passed to the textlogger.

cmd/kube-proxy/app/server_test.go

@@ -422,7 +422,14 @@ kind: KubeProxyConfiguration
 		},
 		Options: logsapi.FormatOptions{
 			JSON: logsapi.JSONOptions{
-				InfoBufferSize: resource.QuantityValue{Quantity: resource.MustParse("0")},
+				OutputRoutingOptions: logsapi.OutputRoutingOptions{
+					InfoBufferSize: resource.QuantityValue{Quantity: resource.MustParse("0")},
+				},
+			},
+			Text: logsapi.TextOptions{
+				OutputRoutingOptions: logsapi.OutputRoutingOptions{
+					InfoBufferSize: resource.QuantityValue{Quantity: resource.MustParse("0")},
+				},
 			},
 		},
 	}