feat(container): versioning

[fabiobozzo]

Right now, the model is the IPLD equivalent of:

[]any{
   tkn1,
   tkn2,
},

Let's change it to something like:

map[string]any{
   "ctn-v1": []any{
      tkn1,
      tkn2,
   },
}

[MichaelMure]

• rebase/squash
• added some fuzzing
• small tweaks