feat: disable Parquet by default (breaking change) (#9920)

I have built a fuzz test and it crashes heavily in seconds and will OOM shortly after.
It seems like supporting Parquet is basically a completely open way to crash the 
server if you can upload a file and run s3 select on it.

Until Parquet is more hardened it is DISABLED by default since hostile 
crafted input can easily crash the server.

If you are in a controlled environment where it is safe to assume no hostile
content can be uploaded to your cluster you can safely enable Parquet.

To enable Parquet set the environment variable `MINIO_API_SELECT_PARQUET=on`
while starting the MinIO server.

Furthermore, we guard parquet by recover functions.

pkg/s3select/select.go

@@ -26,6 +26,7 @@ import (
 	"io"
 	"io/ioutil"
 	"net/http"
+	"os"
 	"strings"
 	"sync"
 
@@ -334,6 +335,9 @@ func (s3Select *S3Select) Open(getReader func(offset, length int64) (io.ReadClos
 		}
 		return nil
 	case parquetFormat:
+		if !strings.EqualFold(os.Getenv("MINIO_API_SELECT_PARQUET"), "on") {
+			return errors.New("parquet format parsing not enabled on server")
+		}
 		var err error
 		s3Select.recordReader, err = parquet.NewReader(getReader, &s3Select.Input.ParquetArgs)
 		return err