Fix issue 275 (edited)

[alcortesm]

Fix #275 .

It was not possible to write a test for this issue as the original fsnoder didn't support filenames with length > 1. Therefore this patch has 3 commits:

1. add support for long filenames in fsnoder.
2. add a test case for the issue using the new long filenames from step 1.
3. fix the issue by comparing paths level by level instead of lexigographically over the whole path.

[alcortesm]

rebased.

[codecov-io]

Codecov Report

Merging #276 into master will increase coverage by 0.25%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #276      +/-   ##
==========================================
+ Coverage   76.62%   76.88%   +0.25%     
==========================================
  Files         116      116              
  Lines        7860     7886      +26     
==========================================
+ Hits         6023     6063      +40     
+ Misses       1183     1169      -14     
  Partials      654      654

Impacted Files	Coverage Δ
utils/merkletrie/noder/path.go	100% <100%> (+100%)	✅
utils/merkletrie/difftree.go	43.15% <100%> (ø)	✅
utils/merkletrie/internal/fsnoder/new.go	94.73% <89.28%> (-5.27%)	❌

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