Migrate nonlocal games 1596 task2 ghz quantum

[ggridin]

The link to the issue: #1596

This pull request covering

1. GHZ quantum tasks 2.1 (creating entangled triple).
2. GHZ quantum task 2.2 (quantum strategies).
3. Quantum strategy discussion.
4. GHZ quantum task 2.3 (quantum game) is converted to demo.

[ggridin]

Testing done:

• Build "python ./build.py" is successful
• Placeholder cases are syntactically correct but failing verifications.
• Solutions are successful.
• Some other failure scenarios were tested manually

[tcNickolas]

This week got crazy, so I didn't get to reviewing this - sorry about that! I'll look on Monday, my calendar is a lot clearer then

[tcNickolas]

I looked at the two tasks this PR adds and left some comments. I'll take a look at the discussion and the demo tomorrow, sorry I can't finish it today, so decided to post a partial review. (Though the comment about not defining variable when measuring can be applied to the demo as well)

Thank you!

[ggridin]

I looked at the two tasks this PR adds and left some comments. I'll take a look at the discussion and the demo tomorrow, sorry I can't finish it today, so decided to post a partial review. (Though the comment about not defining variable when measuring can be applied to the demo as well)

Thank you!

@tcNickolas - Maria, comments are addressed, waiting for re-review.