feat: Migration from coupled server to engine - Python Sub System

[tikikun]

Problem Currently @CameronNg is working on Python sub system, but we are in the process of migrating to a more decoupled project.

@CameronNg needs to refactor it to a single component backend, first version is being implemented by @vansangpfiev

Success Criteria Run alongside with other backends like llama cpp etc, as an engine

[tikikun]

current PR

https://github.com/janhq/cortex/pull/505

[louis-jan]

It's now cortex.python-rt