add support for abstract domain sockets in OpenTelemetry.Exporter.Geneva

[cataggar]

Fixes #1198.

Changes

This allows @ character represent the null byte used in the connection strings for abstract domain sockets.

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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: cataggar / name: Cameron Taggart (0cad285)

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[reyang]

LGTM with a changelog entry.

[utpilla]

Thanks for this PR @cataggar ! I have pushed two minor changes related to CHANGELOG edits: 384549d and f3878fd.

[codecov]

Codecov Report

Merging #1199 (a949b84) into main (18b0b03) will increase coverage by 0.88%.
The diff coverage is 97.57%.

❗ Current head a949b84 differs from pull request most recent head f3878fd. Consider uploading reports for the commit f3878fd to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1199      +/-   ##
==========================================
+ Coverage   73.17%   74.05%   +0.88%     
==========================================
  Files         260      266       +6     
  Lines        9133     9340     +207     
==========================================
+ Hits         6683     6917     +234     
+ Misses       2450     2423      -27     

Impacted Files	Coverage Δ
src/OpenTelemetry.Sampler.AWS/Clock.cs	100.00% <ø> (ø)
...rs.AWS/Http/ServerCertificateValidationProvider.cs	59.67% <80.00%> (+0.30%)	⬆️
.../OpenTelemetry.Sampler.AWS/AWSXRayRemoteSampler.cs	82.60% <91.30%> (+10.86%)	⬆️
src/OpenTelemetry.Sampler.AWS/RulesCache.cs	90.90% <96.00%> (+17.83%)	⬆️
...xporter.Geneva/Internal/ConnectionStringBuilder.cs	92.94% <100.00%> (+0.25%)	⬆️
...ry.ResourceDetectors.AWS/AWSECSResourceDetector.cs	83.69% <100.00%> (ø)
...ry.ResourceDetectors.AWS/AWSEKSResourceDetector.cs	58.62% <100.00%> (ø)
...penTelemetry.ResourceDetectors.AWS/Http/Handler.cs	73.33% <100.00%> (+2.74%)	⬆️
.../OpenTelemetry.Sampler.AWS/AWSXRaySamplerClient.cs	96.61% <100.00%> (+8.51%)	⬆️
src/OpenTelemetry.Sampler.AWS/FallbackSampler.cs	100.00% <100.00%> (ø)
... and 9 more

... and 4 files with indirect coverage changes

[utpilla]

There is an unrelated test failing: https://github.com/open-telemetry/opentelemetry-dotnet-contrib/actions/runs/5127460320/jobs/9224407051?pr=1199#step:7:213