Support BYOIP

[wweiwei-li]

Description

Support BYOIP (Bring Your Own IP) for Global Accelerator

This change enables users to specify custom IP addresses from their own IP address ranges when creating Global Accelerators, instead of relying solely on AWS-provided IP addresses.

Note: Update BYOIP is not supported

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 APPROVED

This pull-request has been approved by: wweiwei-li

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• OWNERS [wweiwei-li]

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[shraddhabang]

/lgtm