Allow logging targets to be configured to receive minio (#8347)

specific errors, `application` errors or `all` by default.

console logging on server by default lists all logs -
enhance admin console API to accept `type` as query parameter to
subscribe to application/minio logs.

cmd/logger/targets.go

@@ -20,7 +20,7 @@ package logger
 // a single log entry and Send it to the log target
 //   e.g. Send the log to a http server
 type Target interface {
-	Send(entry interface{}) error
+	Send(entry interface{}, errKind string) error
 }
 
 // Targets is the set of enabled loggers