LUT mapper

[aletempiac]

This PR includes:

• A new LUT mapper called lut_map offers delay- and area-oriented mapping. Cost functions can be used to define the cost of each LUT during mapping.
• An extension to collapse_mapped to support mapped networks (with mapped_view) with StoreFunction to false. In this case, collapse_mapped computes the function of the mapping on-the-fly.

[lee30sonia]

Are we finally having our own LUT mapper as good as ABC's? 😁

[aletempiac]

Correct! 😉

[codecov-commenter]

Codecov Report

Merging #581 (0807565) into master (8b26b59) will increase coverage by 0.04%.
The diff coverage is 84.16%.

@@            Coverage Diff             @@
##           master     #581      +/-   ##
==========================================
+ Coverage   83.00%   83.05%   +0.04%     
==========================================
  Files         162      163       +1     
  Lines       20231    20928     +697     
==========================================
+ Hits        16793    17382     +589     
- Misses       3438     3546     +108     

Impacted Files	Coverage Δ
include/mockturtle/utils/cost_functions.hpp	67.74% <75.00%> (+2.52%)	⬆️
include/mockturtle/algorithms/lut_mapper.hpp	83.73% <83.73%> (ø)
include/mockturtle/algorithms/collapse_mapped.hpp	91.17% <100.00%> (+1.52%)	⬆️
include/mockturtle/utils/truth_table_cache.hpp	100.00% <100.00%> (ø)
...nclude/mockturtle/algorithms/dsd_decomposition.hpp	91.54% <0.00%> (+4.22%)	⬆️

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