Support input of non three-channel image

[MGAMZ]

Motivation

Current Implementation does not support images with non 3-channels

Modification

Add in_chans augment and pass it to PatchEmbed layer.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.77%. Comparing base (896964b) to head (f378f36).
Report is 17 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1866      +/-   ##
==========================================
- Coverage   65.16%   62.77%   -2.39%     
==========================================
  Files         362      375      +13     
  Lines       26182    27177     +995     
  Branches     4165     4309     +144     
==========================================
  Hits        17061    17061              
- Misses       8501     9495     +994     
- Partials      620      621       +1     

Flag	Coverage Δ
unittests	62.77% <ø> (-2.39%)	⬇️

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[MGAMZ]

Github Shows only 1 file changed, but codecov shows many files have been changed which is not the truth.