[WIP] Add cirq backend

[dallonasnes]

Rename everything to cirq but still use qiskit imports (ran cp -r openqaoa-qiskit openqaoa-cirq first Ran tests for sanity, commented out all (pip install . && pip install -r requirements.txt && pytest tests) Next step: migrating logic to use cirq libraries Then: slowly uncommenting tests

Description

• Please include a summary of the changes and the related issue
• Please also include relevant context.
• List any dependencies that are required for this change, if any.
• Fixes # (issue)

Checklist

• [ ] I have performed a self-review of my code.
• [ ] I have commented my code and used numpy-style docstrings
• [ ] I have made corresponding updates to the documentation.
• [ ] My changes generate no new warnings
• [ ] I have added/updated tests to make sure bugfix/feature works.
• [ ] New and existing unit tests pass locally with my changes.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Name the new unit-tests that you have added along with this change.

[KilianPoirier]

Hey @dallonasnes what is the status on this PR?

Feel free to reach out on our Discord server if you have any question or if you need any support with the changes you're trying to implement.

[dallonasnes]

hey - i'm going to close this pull request. i had seen it mentioned in the docs and thought i could complete it during a few hours layover, but wasn't able to get it done and haven't had time since.

[KilianPoirier]

We are planning on adding this feature as a (more involved) possible contribution at unitaryHACK 2024. If you still want to contribute to OpenQAOA and get rewarded with a bounty from Unitary Fund, you can register for the event.

If not, someone may re-open the PR and pick up your work to finish the feature.

Thank you for trying to help development on OpenQAOA!