Add interface shells as a slicer setting

[AshenRabbitStudios]

Is there an existing issue for this feature request?

• I have searched the existing issues

Is your feature request related to a problem?

When printing a flat top surface with detail/text on top, the slicer will start creating walls and infill corresponding to the top details that descend well into the flat surface.
This causes a bunch of short lines on that flat surface where extrusion,line width, and reflection are inconsistent and messy, regardless of how dialed in the calibration or print settings are.

Orca slicer has a feature called Interface Shells that corrects this issue by isolating those top surface pieces with shells, allowing the flat top surface to print with clean monotonic lines all the way across, then prints the detail on top of that. The outcome is flawless.
This feature doesn't exist in Creality slicer.

A previous issue on this topic was closed, but seemingly under the assumption that it's a multi-extruder feature, when it clearly isn't, since I use it on my K2 daily.
#425

Which printers will be beneficial to this feature?

All

Describe the solution you'd like

Interface shells be implemented in Creality slicer. Extra points if it can be done without requiring multi-color, as multi-color situations are not the only scenario where this is necessary, and to get this effect with single color in Orca, you have to slice as multicolor and use 2 of the same filament.

Here is the wiki article for interface shells:
https://github.com/SoftFever/OrcaSlicer/wiki/multimaterial_settings_advanced#interface-shells

Describe alternatives you've considered

1. Every combination of calibration and settings possible in the slicer to improve top surface line quality.
2. Modifying the model to leave a gap between the top surface and details. If the gap is large enough to prevent embedding walls and infill in the surface, it's interpreted as a mid-air part. If you get close enough (in increments of .01mm) to the surface so that it's not a bridge, it embeds into the top surface.
3. Pausing the print and using ethyl acetate to fix surface quality before the next layer goes down (not acceptable)
4. Using Orca slicer

Additional context

Creality slicer:

Same model in Orca, using interface shells: