updated compatibility with IA and readded NonLinearOettliPrager

[lucaferranti]

PR description

After

• updated compatibility with IA 0.20
• since now ICP is compatible with latest IA versions, readded it as optional dependency

Related issues

Checklist

• [x] Updated/added tests
• [x] Updated/added docstring (needed only for exported functions)
• [x] Updated Project.toml

Other

[codecov-commenter]

Codecov Report

Merging #110 (2277ed3) into main (18db5d5) will increase coverage by 5.96%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   90.96%   96.93%   +5.96%     
==========================================
  Files          14       14              
  Lines         487      489       +2     
==========================================
+ Hits          443      474      +31     
+ Misses         44       15      -29     

Impacted Files	Coverage Δ
src/IntervalLinearAlgebra.jl	100.00% <100.00%> (ø)
src/linear_systems/oettli.jl	100.00% <0.00%> (+50.00%)	:arrow_up:
src/linear_systems/oettli_nonlinear.jl	100.00% <0.00%> (+100.00%)	:arrow_up:

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