DFT+U+V commutator with spinors
Description
Adding the support of the commutator of the position operator and the +U+V nonlocal operator for spinors. Tests are added to cover the DFT+U+V with spinors.
News snippet
Adding the support of the commutator of the position operator and the +U+V nonlocal operator for spinors.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.