feat: s3 switch

tools/s3/README.md

@@ -0,0 +1,12 @@
+# After s3 switches the storage engine, convert the data
+
+- build
+```shell
+go build -o s3convert main.go
+```
+
+- start
+```shell
+./s3convert -config <config dir path> -name <old s3 name>
+# ./s3convert -config ./../../config -name minio
+```