Updated syscalls and uniform CMakeLists.txt

[marcoSanti]

This commit updates the internal syscalls used by the CAPIO to use more generic and modern system calls. It also uniforms the CMakeLists.txt file by ensuring that all different components have flags to enable/disable the compilation

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 63.71%. Comparing base (927ee2e) to head (bb026c1).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
capio/posix/utils/filesystem.hpp	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #221      +/-   ##
==========================================
- Coverage   63.79%   63.71%   -0.09%     
==========================================
  Files          77       76       -1     
  Lines        3193     3183      -10     
  Branches     1988     1979       -9     
==========================================
- Hits         2037     2028       -9     
- Misses        380      384       +4     
+ Partials      776      771       -5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.