✨ CNOT Cancellation Optimization Pass

[burgholzer]

This PR adds a new optimization method to the QFR library which allows to cancel adjacent CNOT gates.

[codecov]

Codecov Report

Merging #101 (b5fb50a) into main (b38fe5f) will increase coverage by 0.4%.
The diff coverage is 82.7%.

@@           Coverage Diff           @@
##            main    #101     +/-   ##
=======================================
+ Coverage   81.7%   82.1%   +0.4%     
=======================================
  Files         44      44             
  Lines       7212    7300     +88     
=======================================
+ Hits        5895    5999    +104     
+ Misses      1317    1301     -16     

Impacted Files	Coverage Δ
src/CircuitOptimizer.cpp	86.5% <77.8%> (+3.7%)	⬆️
include/QuantumComputation.hpp	89.3% <100.0%> (+0.5%)	⬆️
test/unittests/test_qfr_functionality.cpp	100.0% <100.0%> (ø)

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