Material interface

[aperijake]

generalized the interface to the material model.

• Using Eigen maps to allow pointing to field data
• Using striding for compatibility with ngp memory layout
• Working on improving field class

[trunk-io]

⏱️ 4h 22m total CI duration on this PR

Slowest 15 Jobs	Cumulative Duration	Recent Runs
Build Release, GPU	1h 38m	🟩 🟩 🟩
Build Debug, GPU	1h 3m	🟩 🟩
Build Debug	21m	🟩 🟩 🟩
Build Release	20m	🟩 🟩 🟩
Build Debug, Code Coverage	19m	🟩 🟩
Regression Test Release, GPU	7m	🟩 🟩 🟩
Test Release, GPU	5m	🟩 🟩 🟩
Regression Test Debug, GPU	5m	🟩 🟩
Regression Test Debug	4m	🟩 🟩
Test Debug, GPU	4m	🟩 🟩
Test Release	3m	🟩 🟩 🟩
Test Debug	3m	🟥 🟩 🟩
Analyze (javascript-typescript)	3m	🟩 🟩 🟩
Setup	3m	🟩 🟩 🟩
Analyze (python)	3m	🟩 🟩 🟩

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