feat(apigatewayv2): HTTP and HTTP_PROXY WebSocket integrations

[nmussy]

Issue # (if applicable)

Closes #29562.

Reason for this change

Add missing WebSocket integration types

Description of changes

• Implement WebSocketHttpIntegration and WebSocketHttpProxyIntegration classes

Description of how you validated changes

Integs test are a WIP, unit tests will follow

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 3df4b31
• Result: FAILED
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