Switch from docker library to crane

[joestringer]

As proposed in #184 , crane is a smaller, simpler library than pulling in docker for lvh run --image <OCI tag>.

### Tasks
- [ ] Convert over `lvh images pull`
- [ ] Convert over `lvh run`

[mtardy]

The more I use this, the more I'm hesitant to switch because we lose the caching mechanism of the docker daemon 🤔 which is actually handy in some situations.

[joestringer]

Ah. Yes particularly in CI, caching can make a huge difference.