Describe your changes

This PR addresses a few things left borked / open after adding the TimeInterpolatedPotential.

• First, this fixes the way TimeInterpolatedPotential handles array-valued parameters (like Snlm in SCFPotential)
• This also changes some deprecation warnings to future warnings and deprecates the SCFInterpolatedPotential
• This also adds a list of unsupported potentials for TimeInterpolatedPotential that is now validated at initialization

Checklist

• Did you add tests?
• n/a Did you add documentation for your changes?
• Did you reference any relevant issues?
• n/a Did you add a changelog entry? (see CHANGES.rst)
• Are the CI tests passing?
• Is the milestone set?