Improve allocation tests

[amontoison]

• Take into account that some vectors are real in the workspace (KrylovSolver) when we solve complex linear systems;
• The functions that return the number of bits allocated by a method is now generic for matrices of size m x n;
• Test with Float32 and ComplexF32.

[codecov]

Codecov Report

Base: 98.21% // Head: 98.21% // No change to project coverage 👍

Coverage data is based on head (c0d6f68) compared to base (bc93b54).
Patch has no changes to coverable lines.

Additional details and impacted files

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##             main     #660   +/-   ##
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  Coverage   98.21%   98.21%           
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  Files          37       37           
  Lines        6605     6605           
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  Hits         6487     6487           
  Misses        118      118           

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[github-actions]

Package name	latest	stable
CaNNOLeS.jl
DCISolver.jl
FletcherPenaltySolver.jl
JSOSolvers.jl
LLSModels.jl
Percival.jl
RipQP.jl