added skalna06 algorithm for PILS

[lucaferranti]

PR description

added skalna06 algorithm to solve parametric interval linear systems

[codecov-commenter]

Codecov Report

Merging #115 (3f0346b) into main (c4c604a) will increase coverage by 0.09%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   96.93%   97.02%   +0.09%     
==========================================
  Files          16       17       +1     
  Lines         620      639      +19     
==========================================
+ Hits          601      620      +19     
  Misses         19       19              

Impacted Files	Coverage Δ
src/IntervalLinearAlgebra.jl	100.00% <ø> (ø)
src/pils/affine_parametric_array.jl	96.36% <93.54%> (+2.13%)	⬆️
src/pils/pils_solvers.jl	93.75% <93.75%> (ø)
src/pils/affine_expressions.jl	98.73% <100.00%> (ø)

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