Make add by core contract case insensitive

[jribbink]

Closes #1769

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 29.65%. Comparing base (f99a061) to head (d91415d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/dependencymanager/add.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1770      +/-   ##
==========================================
- Coverage   29.68%   29.65%   -0.04%     
==========================================
  Files          89       89              
  Lines        5191     5197       +6     
==========================================
  Hits         1541     1541              
- Misses       3463     3469       +6     
  Partials      187      187              

Flag	Coverage Δ
unittests	29.65% <0.00%> (-0.04%)	⬇️

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