Consider using match/case syntax in powder map CLI

[ajjackson]

Maybe time for a match in future? (Not this PR)

        match args.weighting:
            case 'dos' if args.pdos is None:
                spectrum_1d = sample_sphere_dos(
                    fc, q, **general_kwargs, **calc_modes_kwargs
                )
            case (*_, 'dos', *_):
                spectrum_1d_col = sample_sphere_pdos(
                    fc, q,
                    weighting=_get_pdos_weighting(args.weighting),
                    **general_kwargs,
                    **calc_modes_kwargs)
                spectrum_1d = _arrange_pdos_groups(spectrum_1d_col, args.pdos)
            case 'coherent':
                spectrum_1d = sample_sphere_structure_factor(
                    fc, q,
                    dw=dw,
                    temperature=temperature,
                    **general_kwargs,

Not sure if this is what you mean by "dos" in args.weighting?

Originally posted by @oerc0122 in #437 (comment)