✨ Measurements from output permutation

[burgholzer]

This PR adds the functionality to add measurements according to the output permutation of a quantum circuit.
This is a first step towards realizing #35, in that it correctly conveys the expected output permutation in a standardized fashion.

Furthermore, this PR adds a convenience function to unify all quantum registers of a quantum circuit into a single register, which is useful for mapped circuits.

[codecov]

Codecov Report

Merging #96 (070bfaf) into main (e13d0a8) will increase coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main     #96     +/-   ##
=======================================
+ Coverage   81.5%   81.7%   +0.1%     
=======================================
  Files         44      44             
  Lines       7144    7210     +66     
=======================================
+ Hits        5828    5894     +66     
  Misses      1316    1316             

Impacted Files	Coverage Δ
include/QuantumComputation.hpp	88.8% <ø> (+<0.1%)	⬆️
src/QuantumComputation.cpp	65.2% <100.0%> (+0.8%)	⬆️
test/unittests/test_io.cpp	100.0% <100.0%> (ø)

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[hillmich]

LGTM