Qualcomm AI Engine Direct - Enable SSD300_VGG16 (#3010)

Summary:
- Enable SSD300_VGG16
- Adding new OPs: sqrt, sum_intList
- Add test cases for SSD300 and new OPs
- Repository for SSD300_VGG16: https://github.com/sgrvinod/a-PyTorch-Tutorial-to-Object-Detection

Pull Request resolved: https://github.com/pytorch/executorch/pull/3010

Reviewed By: kirklandsign

Differential Revision: D56280698

Pulled By: cccclai

fbshipit-source-id: 3de0a3e0c705fd2765401d61577c6e10b4eddb39