build cadence cpu flow as a stand-alone cmake dependency (#5555)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/5555
This PR
- Re-enable cadence e2e flow (quant ops, models) on CPU
- move cadence runner builder to cadence runner
- create executor cmake to build runner separately from hifi
- update to cmake builder script for the cpu runner
- add slice_util to reference ops because its missing
- disabled __attribute__((always_inline)) in reference kernel because of  {F1886927939}

Reviewed By: mcremon-meta

Differential Revision: D63284100

fbshipit-source-id: 10955f2ade74788da10aa441d164977b44e4eec5