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Implement the Chebyshev expansion for imaginary time

Sebastian Ohlmannrequested to merge
chebyshev_imaginary_time into main

Description

Now the Chebyshev expansion for the exponential can also be used for the imaginary-time-evolution eigensolver for GS runs. The main difference are other expansion coefficients and other error estimates. Also, the code now uses the normal recurrence formula.

News snippet

Implement the Chebyshev expansion for the exponential for imaginary-time evolution

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.

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