fea linear elements refactor#552

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jibril-b-coulibaly wants to merge 8 commits intoprojectchrono:mainfrom

jibril-b-coulibaly:fea_refactor_optimization

Commits on Feb 24, 2025

add and precompute rest length to Spring element. Refactor force calculation to limit number of expensive length calculations
jibril-b-coulibaly
committed

Commits on Feb 26, 2025

ChElementBar: store stiffness k=EA/l instead of calculating it every step. Refactor force calculations
jibril-b-coulibaly
committed

Commits on Mar 4, 2025

cosmetic clean up and cheaper local displacement calculation when corotational is off
jibril-b-coulibaly
committed