Adds Magnetic constitutive model

[jmartfrut]

Adds a new Magnetic constitutive model, including its implementation and corresponding tests.

This model provides additional flexibility in simulating magnetic material behavior.

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	12cd5b2...	main / 12cd5b2...
Constitutive models/Visco-elastic Ψ	0.0474 ± 0.03 ms	0.0481 ± 0.029 ms	0.986 ± 0.85
Constitutive models/Visco-elastic ∂Ψu	0.0612 ± 0.0023 ms	0.0615 ± 0.0023 ms	0.995 ± 0.053
Constitutive models/Visco-elastic ∂Ψuu	0.11 ± 0.017 ms	0.11 ± 0.016 ms	0.998 ± 0.21
Simulations/ViscoElastic	0.0462 h	0.0465 h	0.995
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	2.35 ± 0.0065 s	2.32 ± 0.0072 s	1.01 ± 0.0042

Memory benchmarks

	main	12cd5b2...	main / 12cd5b2...
Constitutive models/Visco-elastic Ψ	1.24 k allocs: 0.0782 MB	1.24 k allocs: 0.0782 MB	1
Constitutive models/Visco-elastic ∂Ψu	1.36 k allocs: 0.0904 MB	1.36 k allocs: 0.0904 MB	1
Constitutive models/Visco-elastic ∂Ψuu	2.31 k allocs: 0.155 MB	2.31 k allocs: 0.155 MB	1
Simulations/ViscoElastic	2.72 G allocs: 192 GB	2.72 G allocs: 192 GB	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	0.151 k allocs: 11.5 kB	0.151 k allocs: 11.5 kB	1