Investigate AWS Runtimes/Layers

[romeara]

AWS provides "runtimes" and "layers", which may provide new benefits for deployment. We should investigate these concepts and how we might leverage them.

• https://twitter.com/emrahsamdan/status/1069555408556171264
• https://docs.thundra.io/docs/java-custom-runtime-and-layer-support
• https://docs.aws.amazon.com/lambda/latest/dg/runtimes-walkthrough.html
• https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html