[CoreML][OSS] Integrate with CMake (#64523)

[CoreML][OSS] Integrate with CMake (#64523)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64523

- Build Pytorch with CoreML delegate - ` USE_PYTORCH_METAL=ON python setup.py install --cmake`
- Build iOS static libs - `IOS_PLATFORM=SIMULATOR USE_COREML_DELEGATE=1  ./scripts/build_ios.sh`
ghstack-source-id: 138324216

Test Plan:
- Test the Helloword example

{F657778559}

Reviewed By: iseeyuan

Differential Revision: D30594041

fbshipit-source-id: 8cece0b2d4b3ef82d3ef4da8c1054919148beb16