fix: treat blob: urls as safe url

[erfanium]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, I’ve added docs and tests

Description of changes

I use react-markdown to preview an text input when images have not been uploaded to server. so it would be nice to be able to render blob images

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2245c64) 100.00% compared to head (b643a31) 100.00%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff            @@
##              main      #796   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            3         3           
  Lines         1354      1354           
  Branches       113       113           
=========================================
  Hits          1354      1354           

Files	Coverage Δ
lib/index.js	100.00% <100.00%> (ø)

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[wooorm]

You are proposing to change the defaults for everyone. Blobs are not always safe. You can already pass different things if you want that. Pass urlTransform in options