make severity of level computations const

[shaun-cox]

Changes

This is a drive-by change to improve something that I noticed could be a const fn instead of fn and to avoid conversion to and comparison of string slices.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (59728c8) 55.3% compared to head (05c89fa) 55.3%.

Files	Patch %	Lines
opentelemetry-appender-tracing/src/layer.rs	0.0%	9 Missing ⚠️
opentelemetry-appender-log/src/lib.rs	0.0%	5 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1369   +/-   ##
=====================================
  Coverage   55.3%   55.3%           
=====================================
  Files        147     147           
  Lines      18119   18117    -2     
=====================================
+ Hits       10035   10036    +1     
+ Misses      8084    8081    -3     

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[lalitb]

Thanks.

[cijothomas]

CI / test (stable) (pull_request) Successful in 15m

❤️ After the move to contrib! This used to be around 20-30mins before!

[hdost]

@shaun-cox performance is his business 🤘