Add CeedBasisApplyAdd (#1644)

* basis - add CeedBasisApplyAdd + CPU impl

* basis - add ref GPU ApplyAdd

* basis - add shared GPU ApplyAdd

* basis - add MAGMA ApplyAdd

* basis - add CeedB

Add CeedBasisApplyAdd (#1644)

* basis - add CeedBasisApplyAdd + CPU impl

* basis - add ref GPU ApplyAdd

* basis - add shared GPU ApplyAdd

* basis - add MAGMA ApplyAdd

* basis - add CeedBasisApplyAddAtPoints + default impl

* basis - add GPU ApplyAddAtPoints

* tidy - add extra assert to fix clang-tidy

* Apply suggestions from code review

style - consistently use indexing over pointer arithmatic

Co-authored-by: Zach Atkins <zach.atkins@colorado.edu>

* style - more pointer fixes

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Co-authored-by: Zach Atkins <zach.atkins@colorado.edu>

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