Subgraph mapping

[burgholzer]

This PR allows mapping to subgraphs of architectures in the exact mapper, which allows to optimally map small circuits to larger architectures.

[codecov]

Codecov Report

Merging #52 (f08c748) into main (610996c) will increase coverage by 0.0%.
The diff coverage is 96.0%.

@@          Coverage Diff          @@
##            main     #52   +/-   ##
=====================================
  Coverage   89.5%   89.6%           
=====================================
  Files         22      22           
  Lines       1652    1674   +22     
=====================================
+ Hits        1480    1501   +21     
- Misses       172     173    +1     

Impacted Files	Coverage Δ
include/configuration/Configuration.hpp	0.0% <0.0%> (ø)
include/utils.hpp	94.4% <ø> (ø)
src/Architecture.cpp	92.8% <100.0%> (+0.1%)	⬆️
src/exact/ExactMapper.cpp	97.9% <100.0%> (+<0.1%)	⬆️
src/utils.cpp	67.5% <100.0%> (ø)

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