QASM parser

[BrunoLiegiBastonLiegi]

This implements a QASM parser based on https://github.com/openqasm/openqasm.

This closes #1151 and is related to #626 #791.

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 ✅

Project coverage is 100.00%. Comparing base (7bab351) to head (0912a3a).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1207   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           72        73    +1     
  Lines        10516     10531   +15     
=========================================
+ Hits         10516     10531   +15     

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

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[renatomello]

Is anywhere in the docs mentioned that qibo is using QASM 2.0 or QASM 3.0? Does it matter?

[BrunoLiegiBastonLiegi]

Is anywhere in the docs mentioned that qibo is using QASM 2.0 or QASM 3.0? Does it matter?

I don't think it is. We could explicitly say that now we support 3.0, but the problem is that this is not completely true, as not all the functions introduced in 3.0 are supported yet.

[scarrazza]

Then, we could say it is compatible with 3.0.

[renatomello]

Maybe '_openqasm3 could be moved to inside qibo.modelssince it's only used in qibo.models.circuit.py

PS: I think this could still be done. Also the mention of compatibility in the documentation.

[scarrazza]

@BrunoLiegiBastonLiegi could you please fix conflicts so we can proceed?

[scarrazza]

Thanks.