FAQ algorithm

[aurorarossi]

Hello!
In this PR I implemented the graph alignment algorithm 1 of this paper.

[natema]

I checked the generated docs with LiveServer and the $\LaTeX$ is correctly displayed.

[aurorarossi]

Comparison of the objective function values computed with this Julia implementation, a Python implementation and the correct values of 40 instances of the QAP library.

[gdalle]

Hi @aurorarossi, nice PR!
My first review is mostly focused on style and good coding practices. Feel free to ignore some of the remarks, but I think writing type-generic and allocation-free code is a better paradigm in general.
Once you address these comments, I'll do a second pass on the actual content of the algorithm!

Obsolete

[gdalle]

Thank you for the contribution @aurorarossi! Let's do the same with #7 now 💪

[codecov-commenter]

Codecov Report

Patch coverage: 98.78% and project coverage change: -1.22 ⚠️

Comparison is base (6e9bf5a) 100.00% compared to head (6922505) 98.78%.

Additional details and impacted files

@@             Coverage Diff             @@
##              main       #6      +/-   ##
===========================================
- Coverage   100.00%   98.78%   -1.22%     
===========================================
  Files            2        4       +2     
  Lines           33       82      +49     
===========================================
+ Hits            33       81      +48     
- Misses           0        1       +1     

Impacted Files	Coverage Δ
src/flow.jl	96.77% <96.77%> (ø)
src/assignment.jl	100.00% <100.00%> (ø)
src/graph_matching.jl	100.00% <100.00%> (ø)
src/utils.jl	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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