Resolve "Merging mean-field multi-mode electron-photon time-propagation"
Description
Add the Maxwell-Kohn-Sham time-propagation method formulated within the framework of QEDFT relevant for strongly coupled light-matter systems.
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.
Closes #453 (closed)