[cogview4][feat] Support attention mechanism with variable-length support and batch packing (#11349)

* [cogview4] Enhance attention mechanism with variable-length support and batch packing

---------

Co-authored-by: YiYi Xu <[email protected]>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: 3 people