Added coercive volumetric [Constitutive models]

[miguelmaso]

• Added volumetric energy term
• Added test
• Added exports

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	73844aa...	main / 73844aa...
Constitutive models/Visco-elastic Ψ	0.0393 ± 0.018 ms	0.0394 ± 0.017 ms	0.999 ± 0.63
Constitutive models/Visco-elastic ∂Ψ∂F	0.0321 ± 0.0037 ms	0.0327 ± 0.0034 ms	0.983 ± 0.15
Constitutive models/Visco-elastic ∂∂Ψ∂FF	0.0678 ± 0.032 ms	0.0684 ± 0.033 ms	0.991 ± 0.67
Constitutive models/Visco-polyconvex Ψ	0.16 ± 0.001 μs	0.16 ± 0.01 μs	1 ± 0.063
Constitutive models/Visco-polyconvex ∂Ψ∂F	0.181 ± 0.01 μs	0.18 ± 0.009 μs	1.01 ± 0.075
Constitutive models/Visco-polyconvex ∂∂Ψ∂FF	7.28 ± 6 μs	7.36 ± 6.1 μs	0.989 ± 1.2
Simulations/StaticMechanicalDirichlet	0.138 ± 0.0093 s	0.14 ± 0.01 s	0.986 ± 0.098
Simulations/StaticMechanicalNeumann	0.123 ± 0.016 s	0.126 ± 0.016 s	0.977 ± 0.18
Simulations/ViscoElastic	12.9 s	13 s	0.987
Tensor algebra/Cofactor	0.08 ± 0.001 μs	0.08 ± 0.009 μs	1 ± 0.11
Tensor algebra/Det(A)Inv(A')	0.121 ± 0.01 μs	0.121 ± 0.01 μs	1 ± 0.12
Tensor algebra/IIsym	0.07 ± 0.001 μs	0.07 ± 0.01 μs	1 ± 0.14
Tensor algebra/push_forward_C_to_F	0.301 ± 0.01 μs	0.301 ± 0.011 μs	1 ± 0.049
Tensor algebra/×ᵢ⁴	0.07 ± 0.01 μs	0.061 ± 0.01 μs	1.15 ± 0.25
Tensor algebra/δδ_λ_2d	30 ± 0 ns	30 ± 0 ns	1 ± 0
Tensor algebra/δδ_μ_2d	30 ± 0 ns	30 ± 0 ns	1 ± 0
time_to_load	2.75 ± 0.046 s	2.72 ± 0.035 s	1.01 ± 0.021

Memory benchmarks

	main	73844aa...	main / 73844aa...
Constitutive models/Visco-elastic Ψ	0.542 k allocs: 0.0443 MB	0.542 k allocs: 0.0443 MB	1
Constitutive models/Visco-elastic ∂Ψ∂F	0.593 k allocs: 0.0492 MB	0.593 k allocs: 0.0492 MB	1
Constitutive models/Visco-elastic ∂∂Ψ∂FF	1.05 k allocs: 0.0853 MB	1.05 k allocs: 0.0853 MB	1
Constitutive models/Visco-polyconvex Ψ	0 allocs: 0 B	0 allocs: 0 B
Constitutive models/Visco-polyconvex ∂Ψ∂F	0 allocs: 0 B	0 allocs: 0 B
Constitutive models/Visco-polyconvex ∂∂Ψ∂FF	0.187 k allocs: 15.2 kB	0.187 k allocs: 15.2 kB	1
Simulations/StaticMechanicalDirichlet	1.51 M allocs: 0.108 GB	1.51 M allocs: 0.108 GB	1
Simulations/StaticMechanicalNeumann	1.48 M allocs: 0.0927 GB	1.48 M allocs: 0.0927 GB	1
Simulations/ViscoElastic	0.162 G allocs: 12.8 GB	0.162 G allocs: 12.8 GB	1
Tensor algebra/Cofactor	2 allocs: 0.156 kB	2 allocs: 0.156 kB	1
Tensor algebra/Det(A)Inv(A')	4 allocs: 0.25 kB	4 allocs: 0.25 kB	1
Tensor algebra/IIsym	1 allocs: 0.656 kB	1 allocs: 0.656 kB	1
Tensor algebra/push_forward_C_to_F	1 allocs: 0.656 kB	1 allocs: 0.656 kB	1
Tensor algebra/×ᵢ⁴	1 allocs: 0.656 kB	1 allocs: 0.656 kB	1
Tensor algebra/δδ_λ_2d	0 allocs: 0 B	0 allocs: 0 B
Tensor algebra/δδ_μ_2d	0 allocs: 0 B	0 allocs: 0 B
time_to_load	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1