Evolution functions: Created sub module

[miguelmaso]

Changes

• Wraped evolution functions inside submodule: easier to import without moving to the public API.
• Added ramp evolution function, which is the most common evolution function

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	5bda60b...	main / 5bda60b...
Constitutive models/Visco-elastic Ψ	0.0477 ± 0.027 ms	0.0509 ± 0.029 ms	0.936 ± 0.75
Constitutive models/Visco-elastic ∂Ψu	0.0628 ± 0.0069 ms	0.0638 ± 0.0041 ms	0.984 ± 0.13
Constitutive models/Visco-elastic ∂Ψuu	0.111 ± 0.015 ms	0.113 ± 0.023 ms	0.977 ± 0.24
Simulations/StaticMechanicalDirichlet	0.175 ± 0.022 s	0.157 ± 0.014 s	1.11 ± 0.17
Simulations/StaticMechanicalNeumann	0.196 ± 0.0097 s	0.222 ± 0.0098 s	0.882 ± 0.059
Simulations/ViscoElastic	0.0497 h	0.0496 h	1
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	2.71 ± 0.035 s	2.51 ± 0.09 s	1.08 ± 0.041

Memory benchmarks

	main	5bda60b...	main / 5bda60b...
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/StaticMechanicalDirichlet	1.69 M allocs: 0.118 GB	1.7 M allocs: 0.118 GB	0.999
Simulations/StaticMechanicalNeumann	2.19 M allocs: 0.14 GB	2.19 M allocs: 0.14 GB	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	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1