Add AWS entity agent attributes to DynamoDB spans

[hmstepanek]

Overview

Add AWS entity agent attributes to DynamoDB spans. See implementation_guides/aws-sdk.md in agent specs for details.
Note this is dependent on #1249.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	2		0	5.01s
✅ PYTHON	black	3	0	0	1.19s
✅ PYTHON	flake8	3		0	0.64s
✅ PYTHON	isort	3	0	0	0.31s
✅ PYTHON	pylint	3		0	4.88s

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 44.11765% with 38 lines in your changes missing coverage. Please review.

Project coverage is 81.09%. Comparing base (bec0279) to head (1475665).

Files with missing lines	Patch %	Lines
newrelic/hooks/external_botocore.py	44.11%	24 Missing and 14 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1252      +/-   ##
==========================================
- Coverage   81.29%   81.09%   -0.20%     
==========================================
  Files         200      200              
  Lines       22021    22088      +67     
  Branches     3488     3508      +20     
==========================================
+ Hits        17902    17913      +11     
- Misses       2967     3009      +42     
- Partials     1152     1166      +14     

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The merge-base changed after approval.