Added more branches to the benchmarks

[miguelmaso]

I've added more branches to the viscous benchmark because I want to analyze the performance of the loops in the constitutive models.

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	699cb4a...	main / 699cb4a...
Constitutive models/Visco-elastic Ψ	0.0502 ± 0.0097 ms	0.051 ± 0.012 ms	0.984 ± 0.3
Constitutive models/Visco-elastic ∂Ψu	0.0661 ± 0.0042 ms	0.0674 ± 0.005 ms	0.981 ± 0.096
Constitutive models/Visco-elastic ∂Ψuu	0.116 ± 0.017 ms	0.119 ± 0.017 ms	0.978 ± 0.2
Simulations/StaticMechanicalDirichlet	0.154 ± 0.015 s	0.154 ± 0.012 s	0.999 ± 0.12
Simulations/StaticMechanicalNeumann	0.136 ± 0.013 s	0.143 ± 0.012 s	0.949 ± 0.12
Simulations/ViscoElastic	8.88 s	21.9 s	0.406
Tensor algebra/Cofactor	0.07 ± 0.01 μs	0.07 ± 0.01 μs	1 ± 0.2
Tensor algebra/Det(A)Inv(A')	0.13 ± 0.001 μs	0.13 ± 0.001 μs	1 ± 0.011
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	2.55 ± 0.014 s	2.58 ± 0.025 s	0.989 ± 0.011

Memory benchmarks

	main	699cb4a...	main / 699cb4a...
Constitutive models/Visco-elastic Ψ	1.25 k allocs: 0.0789 MB	1.25 k allocs: 0.0789 MB	1
Constitutive models/Visco-elastic ∂Ψu	1.37 k allocs: 0.0911 MB	1.37 k allocs: 0.0911 MB	1
Constitutive models/Visco-elastic ∂Ψuu	2.33 k allocs: 0.158 MB	2.33 k allocs: 0.158 MB	1
Simulations/StaticMechanicalDirichlet	1.61 M allocs: 0.115 GB	1.61 M allocs: 0.115 GB	1
Simulations/StaticMechanicalNeumann	1.48 M allocs: 0.0933 GB	1.48 M allocs: 0.0933 GB	1
Simulations/ViscoElastic	0.129 G allocs: 8.3 GB	0.344 G allocs: 22.3 GB	0.373
Tensor algebra/Cofactor	1 allocs: 0.0781 kB	1 allocs: 0.0781 kB	1
Tensor algebra/Det(A)Inv(A')	4 allocs: 0.25 kB	4 allocs: 0.25 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