Add role based access support in dynamo db

[ChaitanyaSingla]

This pull request introduces IAM-based access for DynamoDB functionality. The AWS SDK will now automatically retrieve the secret access key, access key ID and session token from the appropriate chain provider based on the specified AWS region. This retrieval is for the assumed role attached to the service's instance.

[CLAassistant]

All committers have signed the CLA.

[Sachin4403]

@schmidtw
Please review and merge this pull request.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Project coverage is 47.28%. Comparing base (9e9d66c) to head (8edc241).
Report is 93 commits behind head on main.

Files with missing lines	Patch %	Lines
store/dynamodb/db.go	0.00%	29 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #770       +/-   ##
===========================================
- Coverage   63.46%   47.28%   -16.19%     
===========================================
  Files          18       28       +10     
  Lines        1300     1453      +153     
===========================================
- Hits          825      687      -138     
- Misses        455      746      +291     
  Partials       20       20               

Flag	Coverage Δ
unittests	47.28% <0.00%> (-16.19%)	⬇️

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