[TorchDISC] To support atten::max_pool2d operator

The atten::max_pool2d operator is not supported by disc. This leads to fragmented disc clusters on some CNN models, e.g. VGG, CRNN.
If atten::max_pool2d operator gets supported, the performance of disc on some CNN models (especially with fp16 AMP) will get improved significantly.

The issue identifies the atten::max_pool2d operator as unsupported in DISC and cites VGG and CRNN as affected models. Investigate the TorchDISC operator-support path and verify that these models no longer produce fragmented DISC clusters, using improved performance as the completion signal.

Written by the indexing model from the issue text.