updated oettli-präger

[lucaferranti]

• now users does not need to give list of variables explictly
• initial enclosure is an optional parameter and is automatically computed if not given
• as these functionalities are optional and require ICP.jl to be imported first, Documenter does not include their docstrings in the API docs At the moment, I don't know how to fix this.
• make OettliPrager <: LinearSolver so that it can be used within solve like other solvers.

[codecov-commenter]

Codecov Report

Merging #41 (34eb84e) into main (ac310e0) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   95.92%   96.03%   +0.10%     
==========================================
  Files           8        8              
  Lines         221      227       +6     
==========================================
+ Hits          212      218       +6     
  Misses          9        9              

Impacted Files	Coverage Δ
src/IntervalLinearAlgebra.jl	100.00% <ø> (ø)
src/solvers/oettli.jl	100.00% <100.00%> (ø)
src/solvers/solve.jl	100.00% <0.00%> (ø)

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