[mobile] add test model generation script and ios tests
- update model generation script to cover more ops (including quant ops)
- add more test cases for iOS simulator test
- Need to update GA config to run the new model test on iOS
```
Generated 703 ops and covered 356/393 (90.59%) production ops.
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/74599
Approved by: https://github.com/kit1980
