feat: Add Kafka node metrics to enable AWS_MSK_TOPIC entity relationships to be formed

[tippmar-nr]

Adds two new metrics that are used to synthesize the entity relationship between AWS MSK and the APM entity:

MessageBroker/Kafka/Nodes/<host>:<port>
MessageBroker/Kafka/Nodes/<host>:<port>/<mode>/<topic>

where <host>:<port> is the Kafka server port, <mode> is either Produce or Consume and <topic> is the Kafka topic name

Updates Kafka container tests to validate the new metrics are present

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.80%. Comparing base (a08b0e9) to head (e8633eb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2632      +/-   ##
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- Coverage   80.80%   80.80%   -0.01%     
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  Files         459      459              
  Lines       29064    29065       +1     
  Branches     3191     3191              
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  Hits        23486    23486              
- Misses       4788     4789       +1     
  Partials      790      790              

Flag	Coverage Δ
Agent	81.71% <0.00%> (-0.01%)	⬇️
Profiler	72.59% <ø> (ø)

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Files	Coverage Δ
.../NewRelic/Agent/Core/Utilities/ExtensionsLoader.cs	16.43% <0.00%> (-0.12%)	⬇️

[chynesNR]

Fast work!
I'm not positive collecting just the bootstrap servers is enough to form all the relationships, but we can hash that out during testing.

[chynesNR]

Actually... now that I think about it, we should probably keep these changes in a feature branch until we're sure they work