elasticloadbalancingv2: client keep alive

[badmintoncryer]

Describe the feature

We can configure client keepalive duration for ALB by AWS CDK.

Use Case

ALB now supports configuring HTTP client keepalive duration but CDK cannot configure that.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.132.0

Environment details (OS name and version, etc.)

irrelevant

[github-actions]

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