Added a warning log level.

[Dimi1010]

Split of #1845

This PR adds a Warn log level that sits between ERROR and INFO and can be used to signalize non-critical issues in the runtime.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.21%. Comparing base (824ea14) to head (0752652).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff            @@
##              dev    #1872    +/-   ##
========================================
  Coverage   83.21%   83.21%            
========================================
  Files         285      285            
  Lines       49826    49835     +9     
  Branches    10798    10551   -247     
========================================
+ Hits        41462    41472    +10     
- Misses       7194     7202     +8     
+ Partials     1170     1161     -9     

Flag	Coverage Δ
alpine320	75.49% <100.00%> (+0.01%)	⬆️
fedora42	75.55% <100.00%> (-0.03%)	⬇️
macos-13	80.70% <100.00%> (+<0.01%)	⬆️
macos-14	80.70% <100.00%> (+<0.01%)	⬆️
macos-15	80.69% <100.00%> (+<0.01%)	⬆️
mingw32	70.22% <ø> (-0.04%)	⬇️
mingw64	70.21% <ø> (-0.04%)	⬇️
npcap	85.12% <ø> (-0.02%)	⬇️
rhel94	75.35% <100.00%> (-0.04%)	⬇️
ubuntu2004	59.20% <100.00%> (+0.02%)	⬆️
ubuntu2004-zstd	59.31% <100.00%> (+<0.01%)	⬆️
ubuntu2204	75.30% <100.00%> (+<0.01%)	⬆️
ubuntu2204-icpx	61.57% <ø> (+0.04%)	⬆️
ubuntu2404	75.53% <100.00%> (+<0.01%)	⬆️
ubuntu2404-arm64	75.52% <100.00%> (+<0.01%)	⬆️
unittest	83.21% <100.00%> (+<0.01%)	⬆️
windows-2022	85.10% <ø> (-0.02%)	⬇️
windows-2025	85.16% <ø> (-0.01%)	⬇️
winpcap	85.28% <ø> (ø)
xdp	51.39% <0.00%> (-0.02%)	⬇️

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[tigercosmos]

LGTM