Add launch bounds to hip-gen operator kernel

headers - clearify includes to not rely on transitive includes (#701)

* headers - clearify includes to not rely on transitive includes

* style - add header recommendations from 'include-what-you-

headers - clearify includes to not rely on transitive includes (#701)

* headers - clearify includes to not rely on transitive includes

* style - add header recommendations from 'include-what-you-use'

* style - apply 'include-what-you-use' changes to CUDA backends

* style - 'include-what-you-use' for hip backends

* style - drop ceed.h includes in gallery qf source

* docs - add dev notes for header files

* style - header style and alphabetize

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Merge pull request #668 from CEED/natalie/hip-shared-gen

Add hip-shared and hip-gen backends

add initial ported hip-shared and hip-gen backends