[Pytorch Edge][tracing-based] reorganize model tracer dependency (#63421)
Summary:
1. move 4 files to :
```
KernelDTypeTracer.h
KernelDTypeTracer.h
OperatorCallTracer.h
OperatorCallTracer.h
```
so it's visible in OSS.
2. Update the namespace to `torch::jit::mobile`
3. Add a `fb_xplat_cxx_library` `torch_model_tracer` with the source file list above.
4. update the `fb_xplat_cxx_library` `model_tracer_lib` dependency on the new `torch_model_tracer` library
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63421
ghstack-source-id: 139900299
Reviewed By: dhruvbird
Differential Revision: D30378069
fbshipit-source-id: d56c6140e951bc13113a76d6b63767a93843c842
