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.

Note that we are deliberately not creating an External segment, as that would result in an extra entity being created.

[tippmar-nr]

Looks like we might want to review the CodeCov report - patch coverage is a bit low...

[chynesNR]

This has undergone a significant refactoring, so I'm going to reopen it as a new PR.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.67939% with 24 lines in your changes missing coverage. Please review.

Project coverage is 81.42%. Comparing base (0873941) to head (f229fc1).

Files with missing lines	Patch %	Lines
...gent/Core/Attributes/AttributeDefinitionService.cs	9.09%	10 Missing :warning:
...nt/NewRelic/Agent/Core/Transactions/Transaction.cs	20.00%	8 Missing :warning:
....Agent.Extensions/Collections/ConcurrentHashSet.cs	0.00%	5 Missing :warning:
...ons/NewRelic.Agent.Extensions/AwsSdk/ArnBuilder.cs	98.97%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2784      +/-   ##
==========================================
- Coverage   81.42%   81.42%   -0.01%     
==========================================
  Files         465      466       +1     
  Lines       29563    29692     +129     
  Branches     3278     3305      +27     
==========================================
+ Hits        24071    24176     +105     
- Misses       4698     4721      +23     
- Partials      794      795       +1     

Flag	Coverage Δ
Agent	82.34% <81.67%> (-0.01%)	:arrow_down:
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%)	:arrow_up:
...c/Agent/NewRelic/Agent/Core/Metrics/MetricNames.cs	92.21% <ø> (ø)
...ons/NewRelic.Agent.Extensions/AwsSdk/ArnBuilder.cs	98.97% <98.97%> (ø)
....Agent.Extensions/Collections/ConcurrentHashSet.cs	30.00% <0.00%> (-2.73%)	:arrow_down:
...nt/NewRelic/Agent/Core/Transactions/Transaction.cs	79.92% <20.00%> (-0.81%)	:arrow_down:
...gent/Core/Attributes/AttributeDefinitionService.cs	94.36% <9.09%> (-1.28%)	:arrow_down: