tree: rename walker to path resolver.

[Gottox]

This change renames the tree walker to path resolver. This is done to better reflect the purpose of the struct and avoid misuse.

[codecov]

Codecov Report

Patch coverage: 73.07% and project coverage change: -0.09% ⚠️

Comparison is base (dc22591) 60.44% compared to head (80840f3) 60.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
- Coverage   60.44%   60.35%   -0.09%     
==========================================
  Files          58       59       +1     
  Lines        4672     4702      +30     
  Branches      706      708       +2     
==========================================
+ Hits         2824     2838      +14     
- Misses       1443     1459      +16     
  Partials      405      405              

Files Changed	Coverage Δ
lib/read/tree/walker.c	50.00% <44.44%> (-23.56%)	⬇️
lib/read/tree/path_resolver.c	73.76% <73.76%> (ø)
lib/read/easy/file.c	77.27% <100.00%> (ø)
lib/read/file/file.c	60.33% <100.00%> (ø)
tools/unpack.c	30.85% <100.00%> (ø)

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[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
42 Code Smells

No Coverage information
16.4% Duplication

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