perf: override limit for InputStreamReadData

* the default implementation calls slice, which materializes
* this enables limit to avoid materialization

Author: bogovicj

src/main/java/org/janelia/saalfeldlab/n5/readdata/InputStreamReadData.java

@@ -66,6 +66,11 @@ public ReadData slice(final long offset, final long length) throws N5IOException
 		return bytes.slice(offset, length);
 	}
 
+	@Override
+	public ReadData limit(final long length) {
+		return new InputStreamReadData(inputStream, (int)length);
+	}
+
 	private boolean inputStreamCalled = false;
 
 	@Override