Add carpet plot to the dispiking pipeline

[mhmadAbs]

Carpet plot will be generated as a qc step. Create a Folder called carpet in which the carpet plot will be stored.

[spisakt]

Some more dettails:

• a QC workflow with the @QcPipeline decorator which wraps the carpet plot function, saves its output into the working directory (this may be best to achieve with an additional wrapper function, but for composite plots later, we must retain the current function, too, which returns the matplotlib object)
• the name of the png file should be based on the basename of the nii file it is based on, extended with a "_carpet.png" and located in the workflow's working directory (managed automatically). See https://github.com/pni-lab/PUMI/blob/main/PUMI/utils.py:line282-290 for an example.
• this QC workflow must be added to the despike workflow