Field checksum update

[mwaxmonsky]

Description

Updates C++ implementation and C-redirects to use AMReX structures instead of C/Fortran-based parameters.

Fixes # (issue)

How Has This Been Tested?

Derecho Intel and GCC compilers + TURBO CI.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes