Product updates: memory snapshotting, OIDC, async job queues & more

What this post added

Introduced support for eStargz compression format to speed up image builds from external registries. Added OpenID Connect (OIDC) integration for authenticating against external resources like S3 buckets and secret managers, offering an alternative to Modal Secrets. Enhanced memory snapshotting for faster cold starts, particularly for models like Stable Diffusion. Expanded capabilities for batch processing and job queues with a significantly higher input limit (up to 1 million inputs).