dev(narugo): add local tar index fetch support

[narugo1992]

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[codecov]

Codecov Report

Attention: Patch coverage is 89.09091% with 6 lines in your changes missing coverage. Please review.

Project coverage is 82.58%. Comparing base (1ce0c59) to head (d2f0ba7).

Files	Patch %	Lines
hfutils/index/local_fetch.py	88.67%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   82.32%   82.58%   +0.26%     
==========================================
  Files          45       46       +1     
  Lines        1290     1344      +54     
==========================================
+ Hits         1062     1110      +48     
- Misses        228      234       +6     

Flag	Coverage Δ
unittests	82.58% <89.09%> (+0.26%)	⬆️

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