Updates .gitignore to exclude VS Code settings

[jmartfrut]

Excludes the .vscode/ directory from version control. This prevents project-specific IDE settings from being inadvertently shared.

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	7f8c2ae...	main / 7f8c2ae...
Constitutive models/Visco-elastic Ψ	0.049 ± 0.029 ms	0.0473 ± 0.027 ms	1.04 ± 0.85
Constitutive models/Visco-elastic ∂Ψu	0.0622 ± 0.0034 ms	0.0616 ± 0.0029 ms	1.01 ± 0.073
Constitutive models/Visco-elastic ∂Ψuu	0.111 ± 0.021 ms	0.113 ± 0.016 ms	0.983 ± 0.23
Simulations/ViscoElastic	0.0471 h	0.0481 h	0.98
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 ± 0.02 s	2.52 ± 0.031 s	1.01 ± 0.015

Memory benchmarks

	main	7f8c2ae...	main / 7f8c2ae...
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	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1