Add inbuilt support for multi-channel processing in dip.corr_2d lowering pass

[meshtag]

Is your feature request related to a problem? Please describe.
Current implementation cannot process all channels of the input image at the same time. Thus, feeding each channel separately is a requirement/restriction of current API.

Describe the solution you'd like
The lowering pass should be able to handle multiple image channels on itself without the need of splitting and feeding individual channels of a multi-channelled image.

Additional context
Different alternatives such as creating dedicated operations for channel ordering, modifying inner loops of lowering pass, etc. can/should be considered before presenting a solution.