Replace Symphonia Lambda-Logging with Lambda Powertools

https://github.com/symphoniacloud/lambda-monitoring is no longer maintained. Replace dependency with https://awslabs.github.io/aws-lambda-powertools-java/core/logging/.

No file, test, or entry point is named. Start by locating the Symphonia Lambda-Logging dependency and its logging integration, then compare the AWS Lambda Powertools for Java logging documentation. Done means the old dependency is removed, Powertools is integrated, and the existing logging behavior remains covered by the project’s tests.

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