Add option to disable colorization of depthmap for community Marigold pipeline

[qqii]

Is your feature request related to a problem? Please describe.
The Marigold pipeline has no option to disable generation of the colormap. For my use case I do not need the colormap.

Describe the solution you'd like.
An option to disable generation of the colormap, as I've done in my custom branch. Would it be OK open a PR of that branch?

Describe alternatives you've considered.
Keeping a custom branch.

[yiyixuxu]

Hi!
feel free to open a PR:)