Generalized coefficients

[aperijake]

• rework so field declaration can use info from internal force to know what fields to create
• add an option to specify a different field name for output
• use new fields to create rk output from generalized fields

[trunk-io]

⏱️ 39m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
Build Debug, GPU	10m	🟩
Build Release, GPU	10m	🟩
Build Debug, Code Coverage	6m	🟩
Build Debug	3m	🟩
Build Release	2m	🟩
Setup	2m	🟩
Analyze (python)	2m	🟩
Teardown	50s	🟩
Test Debug	39s	🟩
Test Debug, GPU	35s	🟩
Test Release, GPU	29s	🟩
Test Release	27s	🟩
Regression Test Release	14s	🟩
Regression Test Release, GPU	10s	🟩

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