Adding XAG resub and improving AIG resub

[aletempiac]

Adding:

• Window-based XAG resubstitution
• Window-based AIG resubstitution aig_resubstitution2, which improves aig_resubstitution

[codecov]

Codecov Report

Attention: Patch coverage is 76.19048% with 20 lines in your changes missing coverage. Please review.

Project coverage is 83.82%. Comparing base (ebf35c2) to head (ffe13ba).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
include/mockturtle/algorithms/aig_resub.hpp	76.19%	10 Missing ⚠️
include/mockturtle/algorithms/xag_resub.hpp	76.19%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #658      +/-   ##
==========================================
+ Coverage   83.69%   83.82%   +0.12%     
==========================================
  Files         187      188       +1     
  Lines       29733    29831      +98     
==========================================
+ Hits        24886    25005     +119     
+ Misses       4847     4826      -21     

Flag	Coverage Δ
	83.82% <76.19%> (?)

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