Fix stabilizer effect detection for floating-point exponents

[aditikashi23]

#7750

If this feature is deemed necessary, the fixes have been made: added tolerance for stabilizer effect for XPowGate, YPowGate, and ZPowGate using abs(). A similar change can be made for other gates if desired.

I am a beginner, and this is for a university class assignment to contribute to open-source software, so please let me know if this was not the intended change or something else must be fixed! I apologize in advance if that is the case.

[google-cla]

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[aditikashi23]

I have filled out the CLA and reran the check, please let me know if there is anything else I must do. Thank you!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.38%. Comparing base (8dd8a8f) to head (89e1145).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7770   +/-   ##
=======================================
  Coverage   99.38%   99.38%           
=======================================
  Files        1090     1090           
  Lines       98300    98300           
=======================================
  Hits        97695    97695           
  Misses        605      605           

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[pavoljuhas]

I have filled out the CLA and reran the check, please let me know if there is anything else I must do. Thank you!

The email showing with git log --pretty=fuller on your commit is not known to the CLA. Please set your git email to the one used for the CLA (run git config user.email THE_EMAIL in cirq repo), then redo your commit with the new email (e.g., git commit --amend --reset-author) and force-push the commit.

That said, the issue #7750 is very new and at this stage it is not clear if it should be accepted. For now, please hold on here and if you'd like some other things to work on, please see the issues labeled with good-first-issue or good-for-learning. If you find an interesting one that is already assigned, but has no recent activity, feel free to add a short note you'd like to work on it and I'd be happy to reassign it your way (please add a mention @pavoljuhas so I get pinged).