[ROCm] add rocm/hip backend and add pic for build of rocm/hip (#121)

* add rocm/hip backend and add pic for build of rocm/hip

* ROCm install linking and backend naming

* document rocm in the public device kind list

* add first-class ROCm backend selection

* fix rust build script

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Co-authored-by: CJ Pais <cj@cjpais.com>