[feat] add ipv4 ipam support for alb

[zac-nixon]

Description

Adds support to setting IPAM pool for ALB

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 🌟

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wweiwei-li, zac-nixon

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[gdlx]

Hi @zac-nixon, just seen you've merged a new ingress class param quite quickly in this MR.

I have another one to add in #3860 (for prefix list IDs), that has not been reviewed for 6 months despite Slack requests.

Any chance you could take a look at it ? (I just rebased it to fix conflicts with your MR)

Thanks !