Pull request outline

Support running models created with other frameworks (for now we only support Cog).

This PR makes the following changes:

• Allow Cog models to run locally via pipeline container up (we need to run 2 containers)
• Make the Manager class an abstract base class and add a new CogManager implementation (this forwards requests from the pipeline wrapper container onto the Cog container)
• Some of the container commands have been refactored slightly to make it easier to work with

Still to do:

• Update reference to Cog pipeline wrapper image

Checklist:

• Docs updated
• Version bumped