Deprecated functions from PostProcessors

[miguelmaso]

Some functions from PostProcessors have been deprecated in favour of the more generic interpolate_L2_field and L2_projection.

If approved, the roadmap would be:

1. Merge this PR once 0.0.6 is released in GitHub and published in Julia
   • The version 0.0.6 will continue working with no changes
   • The pre-release version will throw warnings
2. Wait until the future version 0.0.7 is released
   • The version 0.0.7 will throw warnings
3. Create a subsequent PR deleting all the deprecated methods
   • The version 0.0.7 will throw warnings
   • The pre-release version will not provide the removed functions
4. Wait until version 0.0.8 is released
   • The version 0.0.8 will not provide the removed functions

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	a929234...	main / a929234...
Constitutive models/Visco-elastic Ψ	28.5 ± 12 μs	28.6 ± 12 μs	0.997 ± 0.58
Constitutive models/Visco-elastic ∂Ψ∂F	24.5 ± 12 μs	24.3 ± 12 μs	1.01 ± 0.72
Constitutive models/Visco-elastic ∂∂Ψ∂FF	0.0555 ± 0.02 ms	0.0657 ± 0.021 ms	0.844 ± 0.41
Constitutive models/Visco-polyconvex Ψ	0.111 ± 0.002 μs	0.111 ± 0.002 μs	1 ± 0.025
Constitutive models/Visco-polyconvex ∂Ψ∂F	0.125 ± 0.002 μs	0.124 ± 0.003 μs	1.01 ± 0.029
Constitutive models/Visco-polyconvex ∂∂Ψ∂FF	6.7 ± 3.4 μs	6.6 ± 3.4 μs	1.01 ± 0.74
Simulations/StaticMechanicalDirichlet	0.119 ± 0.0089 s	0.12 ± 0.014 s	0.988 ± 0.14
Simulations/StaticMechanicalNeumann	0.0951 ± 0.018 s	0.0969 ± 0.022 s	0.981 ± 0.29
Simulations/ViscoElastic	10.3 s	10.3 s	0.998
Tensor algebra/Cofactor	0.059 ± 0.002 μs	0.06 ± 0.002 μs	0.983 ± 0.047
Tensor algebra/Det(A)Inv(A')	0.084 ± 0.002 μs	0.084 ± 0.002 μs	1 ± 0.034
Tensor algebra/IIsym	0.056 ± 0.003 μs	0.058 ± 0.003 μs	0.966 ± 0.072
Tensor algebra/push_forward_C_to_F	0.18 ± 0.003 μs	0.165 ± 0.008 μs	1.09 ± 0.056
Tensor algebra/×ᵢ⁴	0.056 ± 0.002 μs	0.055 ± 0.002 μs	1.02 ± 0.052
Tensor algebra/δδ_λ_2d	19 ± 1 ns	19 ± 1 ns	1 ± 0.074
Tensor algebra/δδ_μ_2d	19 ± 1 ns	19 ± 1 ns	1 ± 0.074
time_to_load	2.07 ± 0.037 s	2.16 ± 0.026 s	0.962 ± 0.02

Memory benchmarks

	main	a929234...	main / a929234...
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