lib: fix sequence argument handling in Blob constructor

[Ms2ger]

This uses the existing WebIDL infrastructure to handle the iteration over the argument correctly according to the specification.

Note that we can't avoid looping over the input twice: we only know the value of the 'endings' option after converting the blob parts into an array.

[nodejs-github-bot]

Review requested:

• @nodejs/web-standards

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.71%. Comparing base (e419afd) to head (be62641).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62179      +/-   ##
==========================================
- Coverage   89.71%   89.71%   -0.01%     
==========================================
  Files         695      695              
  Lines      214441   214445       +4     
  Branches    41062    41051      -11     
==========================================
- Hits       192384   192383       -1     
+ Misses      14123    14115       -8     
- Partials     7934     7947      +13     

Files with missing lines	Coverage Δ
lib/internal/blob.js	99.44% <100.00%> (+<0.01%)	⬆️

... and 41 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71668/