Docs - logging best practice

[reyang]

Add the initial doc for logging best practices.
Updated the logging benchmark to reflect the latest recommendations.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6250307) 83.38% compared to head (df1133d) 83.12%.
Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5246      +/-   ##
==========================================
- Coverage   83.38%   83.12%   -0.27%     
==========================================
  Files         297      271      -26     
  Lines       12531    11970     -561     
==========================================
- Hits        10449     9950     -499     
+ Misses       2082     2020      -62     

Flag	Coverage Δ
unittests	?
unittests-Solution-Experimental	83.08% <100.00%> (?)
unittests-Solution-Stable	83.11% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...tation.AspNetCore/Implementation/HttpInListener.cs	89.72% <100.00%> (+0.14%)	⬆️
...AspNetCore/Implementation/HttpInMetricsListener.cs	89.47% <ø> (ø)
...plementation/HttpWebRequestActivitySource.netfx.cs	80.77% <100.00%> (ø)
...emetry/Metrics/Exemplar/SimpleExemplarReservoir.cs	80.43% <100.00%> (ø)

... and 33 files with indirect coverage changes

[CodeBlanch]

I think "high bar" might not be clear to everyone. Maybe something like...

• Starting from version 3.1.0 the .NET runtime team has committed to preserve backwards compatibility on the Microsoft.Extensions.Logging packages. There will be no breaking changes (within reason) across major version bumps.

[reyang]

I don't think we can put such strong statement #4920 (comment).