AWS SAM CLI adds BuildKit support for Lambda container images

AI Impact Summary

The SAM CLI team has added BuildKit support, significantly accelerating container image builds for Lambda functions packaged as container images. This enables multi-stage builds, caching, and parallelization, leading to smaller, more optimized images and improved build times. Developers should immediately update to SAM CLI version 1.159.0 or later and utilize the `--use-buildkit` flag to leverage these performance enhancements, particularly when building images for Graviton2 instances.