Add support for NLB access logs

[wiegandf]

Describe the solution you'd like.

Similar to the attach_elb_log_delivery_policy flag, we could have an attach_nlb_log_delivery_policy flag that would account for https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-access-logs.html#access-logging-bucket-requirements.

Describe alternatives you've considered.

Since the module provides the option to attach bucket policies, you can create the policy on your own and attach it to the bucket.

[antonbabenko]

Hi @wiegandf !

Along the same lines, there can be support for other log deliveries by other services, such as CloudTrail, Config, etc.

PS: Pull-request is welcome.

[antonbabenko]

v2.4.0 has been just released.

[github-actions]

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