* open header for custom kernel

* add core utils

* tidy core code

* tify header

* tidy include

* tidy namespace

* resolve conflit

* fix unittest and coverage

* remove platform using

* resolve conflict

* resolve conflict

* fix digamma namespace error

* fix xpu full kernel error

* fix xpu full kernel error

* polish details

* add place for lib storage

* add scale xpu kernel

* add scale xpu kernel

* add scale xpu kernel

* replace with pten scale kernel

* change dev_ctx

* modify float16 head path

* remove unused xpu header