Create `NextjsImageOptimizationFunction`

[bestickley]

Creating a dedicated NextjsImageOptimizationFunction will allow us to:

• not include public/ folder in image
• Fix API Gateway Image Optimization 502 Error with Response Streaming #192 since we can use buffered mode just for image optimization
• excluded 15MB sharp binary from render image

Notes

• Can we use lambda power tools api gw / cloud front / alb -> lambda conversion?

[StuClift]

Can we use lambda power tools api gw / cloud front / alb -> lambda conversion?
What are you thinking here? Is it not cloud front > function url origin > lambda (+ sharp) > S3

[bestickley]

@StuClift, cdk-nextjs supports several different architectures: CloudFront + Lambda, API Gateway + Lambda, ALB + ECS Fargate, CloudFront + ECS Fargate. I want to outsource code that transforms request from proxy to compute.

But, reflecting on this more, maybe we only need the image optimization function for Lambda based architectures... Not as big of a deal for ECS Fargate.