🆕 Add SegFormer Architecture

[Jiaqi-Lv]

Adding SegFormer Architecture for semantic segmentation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.89%. Comparing base (2560759) to head (4f6df20).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #1085    +/-   ##
=========================================
  Coverage    99.88%   99.89%            
=========================================
  Files           85       87     +2     
  Lines        11659    11967   +308     
  Branches      1530     1548    +18     
=========================================
+ Hits         11646    11954   +308     
  Misses           7        7            
  Partials         6        6            

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