Remove debug feature flag

[volsa]

Removes all occurrences of [cfg(feature = "debug")] with log::debug
Resolves #898

[codecov]

Codecov Report

Patch coverage: 89.47% and project coverage change: -0.02 ⚠️

Comparison is base (bfb7463) 96.11% compared to head (cc87c70) 96.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #901      +/-   ##
==========================================
- Coverage   96.11%   96.09%   -0.02%     
==========================================
  Files         116      116              
  Lines       38412    38392      -20     
==========================================
- Hits        36918    36892      -26     
- Misses       1494     1500       +6     

Impacted Files	Coverage Δ
compiler/plc_driver/src/lib.rs	92.68% <66.66%> (ø)
libs/stdlib/tests/common/mod.rs	100.00% <100.00%> (ø)
src/codegen.rs	95.66% <100.00%> (-0.28%)	⬇️
src/linker.rs	85.10% <100.00%> (-0.21%)	⬇️

... and 3 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.