Add labels to circuit wires

[Simone-Bordoni]

Solve issue #1130

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0eeb6ae) 100.00% compared to head (fd42286) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1134   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           67        67           
  Lines         9588      9611   +23     
=========================================
+ Hits          9588      9611   +23     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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[renatomello]

This is almost ready. Coverage probably still needs to be fixed. But most importantly, this functionality should be integrated with Circuit.light_cone before merging.

[Simone-Bordoni]

This is almost ready. Coverage probably still needs to be fixed. But most importantly, this functionality should be integrated with Circuit.light_cone before merging.

Ok, can you update it for the light cone? Cause I also need this functionality for the transpiler but first I need this and #1121