feat: Add AWS S3 scaler - #7899
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Add a new `aws-s3` scaler that scales a workload on the number of objects in an S3 bucket, using the S3 ListObjectsV2 API. The implementation follows the existing AWS SQS queue scaler for its auth, endpoint and typed-config plumbing, and the Azure Blob scaler for its object-counting semantics: - `bucketName` (required), `targetObjectCount` (default 5), `activationTargetObjectCount` (default 0) - `prefix`, `delimiter` (default "/") and `recursive` to control how the bucket is walked; `globPattern` to count only matching keys - `awsRegion` / `awsEndpoint` and the shared AWS authorization helpers, so IRSA/pod-identity and static credentials both work; a custom endpoint enables path-style addressing for S3-compatible stores - results are paginated via the SDK's ListObjectsV2 paginator Includes unit tests covering metadata parsing/defaults, metric spec naming, delimiter vs. glob counting, pagination and error handling, plus a CHANGELOG entry and registration in the scalers builder. Signed-off-by: parthmerchant <parth@parthmerchant.com>
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make generate-scalers-schemahas been run to update any outdated generated filesFixes #
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