Simplify how to call Guard methods

[mic-max]

Fixes #2818 (comment)

Thanks for the suggestion @CodeBlanch and help with getting this working :)

Changes

paramName will work without having to add the nameof(myVar) argument.

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• Appropriate CHANGELOG.md updated for non-trivial changes
• Design discussion issue #
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #2894 (fd43cdd) into main (73b99b6) will decrease coverage by 0.01%.
The diff coverage is 93.03%.

@@            Coverage Diff             @@
##             main    #2894      +/-   ##
==========================================
- Coverage   84.21%   84.20%   -0.02%     
==========================================
  Files         251      252       +1     
  Lines        8889     8893       +4     
==========================================
+ Hits         7486     7488       +2     
- Misses       1403     1405       +2     

Impacted Files	Coverage Δ
src/OpenTelemetry.Api/Internal/Guard.cs	0.00% <0.00%> (ø)
...y.Exporter.Prometheus/PrometheusExporterOptions.cs	84.21% <50.00%> (ø)
...c/OpenTelemetry/Logs/OpenTelemetryLoggerOptions.cs	72.72% <50.00%> (ø)
...c/OpenTelemetry/Metrics/MeterProviderExtensions.cs	30.30% <50.00%> (ø)
...rc/OpenTelemetry/Trace/TracerProviderExtensions.cs	40.00% <66.66%> (ø)
...OpenTelemetry.Shims.OpenTracing/SpanBuilderShim.cs	91.48% <88.88%> (ø)
src/OpenTelemetry.Api/Baggage.cs	100.00% <100.00%> (ø)
.../Context/Propagation/CompositeTextMapPropagator.cs	83.33% <100.00%> (ø)
src/OpenTelemetry.Api/Context/RuntimeContext.cs	90.90% <100.00%> (ø)
src/OpenTelemetry.Api/Trace/SpanAttributes.cs	100.00% <100.00%> (ø)
... and 68 more

[reyang]

Nice! 👍

[alanwest]

😮 Neato!

[AHMAD697261]

That's great