Upgrade to Qiskit 1.0.0

[MoritzWillmann]

This PR incorporates fixes needed to use the new Qiskit 1.0.0. This includes:

• using the standalone qiskit-algorithms package
• using the standalone qiskit-aer package everywhere, where it wasn't used yet
• using the aer_simulator instead of statevector_simulator and qasm_simulator with according settings

So far the tests still fail, due to qiskit-algorithms not being updated to work with Qiskit 1.0.0 yet. I will expect an update soon and will then fix the version and set the PR to ready for review.

• [x] fix qiskit-algorithm version

Note

If you want to use squlearn until the update, be sure to install Qiskit<1.0.0

[MoritzWillmann]

You're right i implemented backend_name and is_statevector functions to handle this