Allow Sharing Models via Corvus

[lissahyacinth]

Corvus is the (currently) unreleased CLI for ShareableAI, allowing for changing the ownership, visbility, and sharing permissions of models, plus some extras!

Corvus doesn't presently have the features to allow sharing models, although it's all present in the backend. This issue tracks the public release for Corvus and the addition of documentation to go alongside using Jackdaw.

[lissahyacinth]

Corvus is now released at https://github.com/shareableai/corvus/tree/v0.0.1-alpha, but doesn't (yet) allow for sharing models via CLI, only opens up search functionality to the terminal.