Parallelize fetching

[quambene]

Parallelize requests for fetching bookmarks

[codecov-commenter]

Codecov Report

Attention: 66 lines in your changes are missing coverage. Please review.

Comparison is base (83437b7) 90.36% compared to head (1a1037a) 59.64%.

❗ Current head 1a1037a differs from pull request most recent head b31f13d. Consider uploading reports for the commit b31f13d to get more accurate results

Files	Patch %	Lines
src/cmd/fetch.rs	0.00%	52 Missing ⚠️
src/cmd/update.rs	0.00%	8 Missing ⚠️
src/cmd/init.rs	0.00%	4 Missing ⚠️
src/settings.rs	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #4       +/-   ##
===========================================
- Coverage   90.36%   59.64%   -30.73%     
===========================================
  Files          31       22        -9     
  Lines        4070     1784     -2286     
===========================================
- Hits         3678     1064     -2614     
- Misses        392      720      +328     

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