Added AWS SDK Changes to support Bedrock spans and Application Signals

[AsakerMohd]

Changes

Added changes to detect bedrock spans and populate attributes accordingly. Also added logic to populate aws specific attributes used by AWS Application Signals like "aws.region", "aws.service", "aws.operation", "aws.requestId", etc. We are currently using our own fork of Opentelemetry-Instrumentation-AWS here: https://github.com/aws-observability/aws-otel-dotnet-instrumentation/tree/main/src/OpenTelemetry.Instrumentation.AWS. This change syncs our local fork so that we can stop relying on it and instead reference this directly instead.

I did some manual testing and was able to verify that the spans created contain the required information.

This PR builds on top of this PR: #2458. The old PR went stale especially after moving from AWS SDK v3 to v4. Most of the comments there have been addressed and most of the semconvs used here are now merged in the semconv pkg.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

❌ Patch coverage is 73.95833% with 75 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.33%. Comparing base (0e8f8fd) to head (81441f1).
⚠️ Report is 11 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...on.AWS/Implementation/AWSTracingPipelineHandler.cs	49.46%	47 Missing ⚠️
...ntation.AWS/Implementation/AWSLlmModelProcessor.cs	86.25%	22 Missing ⚠️
...strumentation.AWS/AWSInstrumentationEventSource.cs	50.00%	3 Missing ⚠️
...strumentation.AWS/Implementation/AWSServiceType.cs	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3257      +/-   ##
==========================================
- Coverage   70.35%   70.33%   -0.02%     
==========================================
  Files         440      442       +2     
  Lines       17213    17433     +220     
==========================================
+ Hits        12110    12262     +152     
- Misses       5103     5171      +68     

Flag	Coverage Δ
unittests-Contrib.Shared.Tests	86.25% <ø> (ø)
unittests-Exporter.Geneva	53.78% <ø> (+0.11%)	⬆️
unittests-Exporter.InfluxDB	95.14% <ø> (ø)
unittests-Exporter.Instana	74.86% <ø> (ø)
unittests-Exporter.OneCollector	94.61% <ø> (ø)
unittests-Extensions	90.65% <ø> (ø)
unittests-Extensions.Enrichment	100.00% <ø> (ø)
unittests-Extensions.Enrichment.AspNetCore	86.27% <ø> (ø)
unittests-Extensions.Enrichment.Http	94.33% <ø> (ø)
unittests-Instrumentation.AWS	80.25% <73.95%> (-3.56%)	⬇️
unittests-Instrumentation.AspNet	77.92% <ø> (ø)
unittests-Instrumentation.AspNetCore	70.76% <ø> (ø)
unittests-Instrumentation.Cassandra	23.52% <ø> (ø)
unittests-Instrumentation.ConfluentKafka	14.10% <ø> (ø)
unittests-Instrumentation.ElasticsearchClient	80.12% <ø> (ø)
unittests-Instrumentation.EntityFrameworkCore	80.80% <ø> (ø)
unittests-Instrumentation.EventCounters	76.36% <ø> (ø)
unittests-Instrumentation.GrpcCore	91.42% <ø> (ø)
unittests-Instrumentation.GrpcNetClient	79.61% <ø> (ø)
unittests-Instrumentation.Hangfire	84.61% <ø> (ø)
unittests-Instrumentation.Http	74.18% <ø> (ø)
unittests-Instrumentation.Owin	88.62% <ø> (ø)
unittests-Instrumentation.Process	100.00% <ø> (ø)
unittests-Instrumentation.Quartz	78.76% <ø> (ø)
unittests-Instrumentation.Runtime	100.00% <ø> (ø)
unittests-Instrumentation.ServiceFabricRemoting	34.54% <ø> (ø)
unittests-Instrumentation.SqlClient	87.29% <ø> (ø)
unittests-Instrumentation.StackExchangeRedis	71.80% <ø> (ø)
unittests-Instrumentation.Wcf	79.68% <ø> (+0.13%)	⬆️
unittests-OpAmp.Client	71.55% <ø> (ø)
unittests-PersistentStorage	65.88% <ø> (+0.66%)	⬆️
unittests-Resources.AWS	74.42% <ø> (ø)
unittests-Resources.Azure	85.31% <ø> (ø)
unittests-Resources.Container	67.34% <ø> (ø)
unittests-Resources.Gcp	71.42% <ø> (ø)
unittests-Resources.Host	71.85% <ø> (ø)
unittests-Resources.OperatingSystem	76.98% <ø> (ø)
unittests-Resources.Process	100.00% <ø> (ø)
unittests-Resources.ProcessRuntime	79.59% <ø> (ø)
unittests-Sampler.AWS	87.18% <ø> (ø)

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

Files with missing lines	Coverage Δ
...rumentation.AWS/Implementation/AWSServiceHelper.cs	92.45% <100.00%> (-6.27%)	⬇️
...strumentation.AWS/AWSInstrumentationEventSource.cs	50.00% <50.00%> (ø)
...strumentation.AWS/Implementation/AWSServiceType.cs	50.00% <40.00%> (-21.43%)	⬇️
...ntation.AWS/Implementation/AWSLlmModelProcessor.cs	86.25% <86.25%> (ø)
...on.AWS/Implementation/AWSTracingPipelineHandler.cs	65.16% <49.46%> (-21.26%)	⬇️

... and 5 files with indirect coverage changes

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