Added interface for the viscous evolution law

[miguelmaso]

Added and exported the function return_mapping.

The new function is in charge to provide a Gridap-like method that updates the internal variable.

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	f8a9aaf...	main / f8a9aaf...
Constitutive models/Visco-elastic Ψ	0.0344 ± 0.015 ms	23.6 ± 15 μs	1.46 ± 1.1
Constitutive models/Visco-elastic ∂Ψ∂F	27.4 ± 14 μs	28.1 ± 14 μs	0.976 ± 0.7
Constitutive models/Visco-elastic ∂∂Ψ∂FF	0.0545 ± 0.028 ms	0.0562 ± 0.029 ms	0.97 ± 0.7
Constitutive models/Visco-polyconvex Ψ	0.14 ± 0.01 μs	0.14 ± 0.01 μs	1 ± 0.1
Constitutive models/Visco-polyconvex ∂Ψ∂F	0.16 ± 0 μs	0.16 ± 0 μs	1 ± 0
Constitutive models/Visco-polyconvex ∂∂Ψ∂FF	6.84 ± 5.5 μs	6.87 ± 5.4 μs	0.995 ± 1.1
Simulations/StaticMechanicalDirichlet	0.121 ± 0.009 s	0.119 ± 0.0067 s	1.02 ± 0.095
Simulations/StaticMechanicalNeumann	0.104 ± 0.016 s	0.108 ± 0.019 s	0.962 ± 0.22
Simulations/ViscoElastic	10.8 s	10.7 s	1.01
Tensor algebra/Cofactor	0.07 ± 0.01 μs	0.07 ± 0.001 μs	1 ± 0.14
Tensor algebra/Det(A)Inv(A')	0.1 ± 0.001 μs	0.1 ± 0.01 μs	1 ± 0.1
Tensor algebra/IIsym	0.07 ± 0.009 μs	0.06 ± 0.01 μs	1.17 ± 0.25
Tensor algebra/push_forward_C_to_F	0.311 ± 0.029 μs	0.301 ± 0.01 μs	1.03 ± 0.1
Tensor algebra/×ᵢ⁴	0.07 ± 0.01 μs	0.06 ± 0.01 μs	1.17 ± 0.26
Tensor algebra/δδ_λ_2d	20 ± 10 ns	20 ± 10 ns	1 ± 0.71
Tensor algebra/δδ_μ_2d	20 ± 10 ns	20 ± 10 ns	1 ± 0.71
time_to_load	2.29 ± 0.016 s	2.23 ± 0.021 s	1.03 ± 0.012

Memory benchmarks

	main	f8a9aaf...	main / f8a9aaf...
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