consume lima templates over OCI registries

### Description

OCI registries are evolving to store any kind of artifact, thanks to OCI artifacts. So many tools are out there that have been already adapted consuming their configs over OCI registries such as conftest (ability to pull/push Rego policies), Flux (kustomizer.dev), Tekton (Tekton Bundle), Helm (Charts OCI Registry support), etc.

What I'd like to propose is that we can store and distribute Lima templates over OCI registries too:

```shell
# devopps/my-lima-template:v0.1.0 this image will hold the template itself within its layer
$ lima start template://devopps/my-lima-template:v0.1.0
```

cc: @AkihiroSuda @dentrax @jandubois