Exponential Bucket Histogram - part 9

[reyang]

Following #3462.

Changes

• Added support for older runtime versions (< net6.0) by rewriting to logic to avoid Math.ScaleB, Math.IsNegative and Math.Log2 dependency.
• Added more tests.

[codecov]

Codecov Report

Merging #3553 (2d3eae4) into main (6205879) will increase coverage by 0.37%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3553      +/-   ##
==========================================
+ Coverage   86.95%   87.32%   +0.37%     
==========================================
  Files         275      275              
  Lines        9959     9959              
==========================================
+ Hits         8660     8697      +37     
+ Misses       1299     1262      -37     

Impacted Files	Coverage Δ
...penTelemetry/Metrics/ExponentialBucketHistogram.cs	78.26% <100.00%> (+13.04%)	⬆️
...ZPages/Implementation/ZPagesExporterEventSource.cs	56.25% <0.00%> (-6.25%)	⬇️
...emetry.Api/Internal/OpenTelemetryApiEventSource.cs	73.52% <0.00%> (-2.95%)	⬇️
src/OpenTelemetry/BatchExportProcessor.cs	82.24% <0.00%> (-1.87%)	⬇️
...tpListener/Internal/PrometheusCollectionManager.cs	80.48% <0.00%> (+2.43%)	⬆️
...metryProtocol/Implementation/ActivityExtensions.cs	95.60% <0.00%> (+4.39%)	⬆️
...tation/OpenTelemetryProtocolExporterEventSource.cs	85.00% <0.00%> (+10.00%)	⬆️
src/OpenTelemetry/Logs/Pool/LogRecordSharedPool.cs	100.00% <0.00%> (+21.05%)	⬆️
...xporter.OpenTelemetryProtocol/OtlpTraceExporter.cs	77.27% <0.00%> (+40.90%)	⬆️
... and 1 more