feat(chart): support configuring dnsConfig

[sslavic]

Issue

#4154

Description

PR extends aws-load-balancer-controller Helm chart with support for configuring dnsConfig.

PR was tested manually with helm template:

• backward compatibility preserved, there are no template changes with default values
• when dnsConfig is provided, it gets set for the Deployment Pod template spec

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: sslavic
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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @sslavic. Thanks for your PR.

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[shraddhabang]

@sslavic You dont need to update the chart version here. We will do it when we release.

[sslavic]

thanks for review @shraddhabang, I've removed manual chart version change from the PR, PTAL

[shraddhabang]

@sslavic Thank you for your PR.
/ok-to-test

[shraddhabang]

/retest