add annotation to enable shield advanced protection for nlb

[csauoss]

Issue

Fixes #3752

Description

• Added annotation boolean aws-load-balancer-nlb-shield-advanced-protection for service.beta.kubernetes.io
• it defaults to false
• Updated annotations.md

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: csauoss
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[k8s-ci-robot]

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[k8s-ci-robot]

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