eStargz support for lazy pulling

[termoshtt]

• Reference: https://github.com/containerd/stargz-snapshotter/blob/main/docs/estargz.md
• Blog (EN)
  • https://medium.com/nttlabs/startup-containers-in-lightning-speed-with-lazy-image-distribution-on-containerd-243d94522361
• Blog (JP)
  • https://knqyf263.hatenablog.com/entry/2021/06/15/071057