feat: Instrument Lambda invocations in AWS SDK

[chynesNR]

Instrument calls to Lambdas and Lambda Aliases from the AWS SDK, with span attributes to allow linking the calls to the actual Lambda (specifically the ARN is what's needed). Includes unit and integration tests. We are able to test without a making a successful call to a lambda, so no live testing resources are necessary.

Also includes a new wrapper for AmazonServiceClient and logic to parse the AWS account ID from the Access Key credential. Currently supports only a single account ID per application and falls back to using the account ID from configuration if parsing is unsuccessful. We may need to revisit this logic to support multiple account IDs (one per service client instance) and consider whether using the value from configuration should take precedence or remain as a fallback.

Changes since the last PR:

• Does not treat the segment as a Leaf, so we will get an additional HTTP span, which is now expected
• Caps the size of the ARN cache
• Limits most errors to log only once
• Does not log the account ID, only if it is present or not

[tippmar-nr]

Nice work!

[chynesNR]

Moving this back to Draft until we get final word on the External segment discussion

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.00599% with 5 lines in your changes missing coverage. Please review.

Project coverage is 81.73%. Comparing base (63788ff) to head (64c170f).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
....Agent.Extensions/Collections/ConcurrentHashSet.cs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2901      +/-   ##
==========================================
+ Coverage   81.42%   81.73%   +0.30%     
==========================================
  Files         465      467       +2     
  Lines       29563    29800     +237     
  Branches     3278     3315      +37     
==========================================
+ Hits        24073    24356     +283     
+ Misses       4697     4649      -48     
- Partials      793      795       +2     

Flag	Coverage Δ
Agent	82.68% <97.00%> (+0.32%)	⬆️
Profiler	73.13% <ø> (ø)

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

Files with missing lines	Coverage Δ
...elic/Agent/Core/AgentHealth/AgentHealthReporter.cs	87.40% <100.00%> (+0.17%)	⬆️
...gent/Core/Attributes/AttributeDefinitionService.cs	95.71% <100.00%> (+0.06%)	⬆️
...c/Agent/NewRelic/Agent/Core/Metrics/MetricNames.cs	92.21% <ø> (ø)
.../Agent/NewRelic/Agent/Core/Segments/NoOpSegment.cs	100.00% <100.00%> (+88.88%)	⬆️
src/Agent/NewRelic/Agent/Core/Segments/Segment.cs	98.37% <100.00%> (+6.35%)	⬆️
...nt/NewRelic/Agent/Core/Transactions/Transaction.cs	80.73% <100.00%> (ø)
...ons/NewRelic.Agent.Extensions/AwsSdk/ArnBuilder.cs	100.00% <100.00%> (ø)
...lic.Agent.Extensions/AwsSdk/AwsAccountIdDecoder.cs	100.00% <100.00%> (ø)
....Agent.Extensions/Collections/ConcurrentHashSet.cs	30.00% <0.00%> (-2.73%)	⬇️

... and 8 files with indirect coverage changes