dynamodb: Auto discover AWS Account

[meiao]

Overview

Allows the DynamoDB instrumentation to auto-discover the AWS account ID, so it does not have to be provided using the Cloud API nor configuration.

Related Github Issue

Closes #2124

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.95652% with 6 lines in your changes missing coverage. Please review.

Project coverage is 70.74%. Comparing base (ff8fa95) to head (05b0c28).
Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
...om/newrelic/agent/cloud/AwsAccountDecoderImpl.java	82.14%	2 Missing and 3 partials ⚠️
...in/java/com/newrelic/agent/cloud/CloudApiImpl.java	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2148      +/-   ##
============================================
+ Coverage     70.72%   70.74%   +0.01%     
- Complexity     9987    10008      +21     
============================================
  Files           841      842       +1     
  Lines         40290    40346      +56     
  Branches       6107     6115       +8     
============================================
+ Hits          28495    28541      +46     
- Misses         9051     9058       +7     
- Partials       2744     2747       +3     

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