feat(aws-sqs): Support for scaling to include delayed messages

[phr3nzii]

This pull request introduces an option to include delayed messages when calculating the message count with the AWS SQS scaler.

Checklist

• When introducing a new scaler, I agree with the scaling governance policy
• I have verified that my change is according to the deprecations & breaking changes policy
• Tests have been added
• Changelog has been updated and is aligned with our changelog requirements
• A PR is opened to update our Helm chart (repo) (if applicable, ie. when deployment manifests are modified) - Not applicable
• A PR is opened to update the documentation on (repo) (if applicable) - feat(aws-sqs): Support for scaling to include delayed messages keda-docs#1213
• Commits are signed with Developer Certificate of Origin (DCO - learn more)

Fixes #4377
Relates to and supersedes #4383
Documentation kedacore/keda-docs#1213

[github-actions]

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[JorTurFer]

LGTM! ❤️

[JorTurFer]

/run-e2e aws
Update: You can check the progress here