feat(lambda-layer-node-proxy-agent): depend on @awscdk/asset-node-proxy-agent-v5 and reduce aws-cdk-lib size (#22769)

This PR reduces the size of aws-cdk-lib by 1.4 MB, by extracting the lambda-layer-node-proxy-agent/lib/layer.zip file to a separate package that aws-cdk-lib will directly depend on.

This change also reduce the complexity of the build in the aws-cdk repo because the process of building the layer.zip inside of a Docker container has also been extracted to the separate package. See https://github.com/cdklabs/awscdk-asset-node-proxy-agent/tree/main

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Author: kaizencc