tools: support longopts

[Gottox]

This change introduces initial longopts support for the command line tools. It also updates the man pages to reflect the new options.

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
36.5% Duplication

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[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (3977ff2) 60.44% compared to head (5a0a742) 60.44%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #153   +/-   ##
=======================================
  Coverage   60.44%   60.44%           
=======================================
  Files          59       59           
  Lines        4702     4702           
  Branches      708      708           
=======================================
  Hits         2842     2842           
  Misses       1455     1455           
  Partials      405      405           

Files	Coverage Δ
tools/src/ls.c	33.91% <100.00%> (ø)
tools/src/cat.c	41.17% <0.00%> (ø)
tools/src/stat.c	0.00% <0.00%> (ø)
tools/src/unpack.c	30.85% <0.00%> (ø)
tools/src/xattr.c	0.00% <0.00%> (ø)

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