Expose dead_letter_target_arn variable from lambda module

[chris3ware]

Is your request related to a new offering from AWS?

No

Is your request related to a problem? Please describe.

I'm unable to configure a dead-letter queue for the lambda function

Describe the solution you'd like.

I'd like to be able to pass a dead-letter queue arn into the module. The child module - terraform-aws-lambda - support this.

Describe alternatives you've considered.

Additional context

The AWS config NCSC Cloud Security Principles conformance pack checks for the presence of a dead-letter queue for lambda functions.

[antonbabenko]

This should be a relatively simple addition if anyone wants to work on it.

If not, I put it in the priority queue since you are my GitHub Sponsor, and I will make it during the week!

[antonbabenko]

This issue has been resolved in version 5.4.0 🎉

[github-actions]

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