make Error level of BC messages configurable and add info to README.

[tidal]

No description provided.

[codecov]

Codecov Report

Merging #657 (394b49a) into main (39c99e5) will decrease coverage by 0.18%.
The diff coverage is 87.50%.

@@             Coverage Diff              @@
##               main     #657      +/-   ##
============================================
- Coverage     84.46%   84.27%   -0.19%     
- Complexity     1140     1152      +12     
============================================
  Files           126      127       +1     
  Lines          2761     2786      +25     
============================================
+ Hits           2332     2348      +16     
- Misses          429      438       +9     

Flag	Coverage Δ
7.4	84.22% <87.50%> (-0.19%)	⬇️
8.0	84.27% <87.50%> (-0.19%)	⬇️
8.1	84.27% <87.50%> (-0.19%)	⬇️

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Impacted Files	Coverage Δ
src/SDK/Common/Dev/Compatibility/Util.php	92.59% <87.50%> (-7.41%)	⬇️
src/Contrib/OtlpGrpc/Exporter.php	90.00% <0.00%> (-1.53%)	⬇️
src/Contrib/Jaeger/SpanConverter.php	96.47% <0.00%> (-0.24%)	⬇️
src/SDK/Resource/ResourceInfoFactory.php	0.00% <0.00%> (ø)
src/Contrib/Jaeger/IdConverter.php	100.00% <0.00%> (ø)

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[brettmc]

approved with one comment to look at