Introduce simpler GetMultipartInfo call for performance (#9722)

Advantages avoids 100's of stats which are needed for each
upload operation in FS/NAS gateway mode when uploading a large
multipart object, dramatically increases performance for
multipart uploads by avoiding recursive calls.

For other gateway's simplifies the approach since
azure, gcs, hdfs gateway's don't capture any specific
metadata during upload which needs handler validation
for encryption/compression.

Erasure coding was already optimized, additionally
just avoids small allocations of large data structure.

Fixes #7206

cmd/gateway/gcs/gateway-gcs.go

@@ -1152,6 +1152,14 @@ func gcsGetPartInfo(ctx context.Context, attrs *storage.ObjectAttrs) (minio.Part
 	}, nil
 }
 
+// GetMultipartInfo returns multipart info of the uploadId of the object
+func (l *gcsGateway) GetMultipartInfo(ctx context.Context, bucket, object, uploadID string, opts minio.ObjectOptions) (result minio.MultipartInfo, err error) {
+	result.Bucket = bucket
+	result.Object = object
+	result.UploadID = uploadID
+	return result, nil
+}
+
 //  ListObjectParts returns all object parts for specified object in specified bucket
 func (l *gcsGateway) ListObjectParts(ctx context.Context, bucket string, key string, uploadID string, partNumberMarker int, maxParts int, opts minio.ObjectOptions) (minio.ListPartsInfo, error) {
 	it := l.client.Bucket(bucket).Objects(ctx, &storage.Query{