Support for AWS JSON log level format

[artkhod]

According to https://docs.datadoghq.com/logs/guide/logs-show-info-status-for-warnings-or-errors/ we can remap status from let's say "level" or include status attribute ourselves.

datadog-lambda-extension/bottlecap/src/logs/lambda/mod.rs

Line 55 in 0e9fc6f

status: status.unwrap_or("info".to_string()),

However, since it's a lambda extension, it would make sense to support AWS JSON Log format

{
  "timestamp": "2025-08-27T10:25:22.244Z",
  "level": "WARN", <--- level is uppercase, and it drives the log level setting on the lambda configuration itself
  "message": "AWS Lambda plans to remove support for callback-based function handlers starting with Node.js 24. You will need to update this function to use an async handler to use Node.js 24 or later. For more information and to provide feedback on this change, see https://github.com/aws/aws-lambda-nodejs-runtime-interface-client/issues/137. To disable this warning, set the AWS_LAMBDA_NODEJS_DISABLE_CALLBACK_WARNING environment variable."
}

Here's the list of levels https://github.com/aws-powertools/powertools-lambda-typescript/blob/801333deff04b09d4adb88860c60f497295685d9/packages/logger/src/constants.ts#L17

JSON log format can be set here

and it's described by this section https://docs.aws.amazon.com/lambda/latest/dg/monitoring-cloudwatchlogs-logformat.html#monitoring-cloudwatchlogs-JSON-application