epic: Cortex Presets

[dan-menlo]

Goal

• Cortex is able to apply presets
• e.g. llama3.1 presets for any llama3.1 finetune
• Enables: https://github.com/janhq/jan/issues/2845

UX

# Filesystem
/cortexcpp
    /engines
    /models
    /presets
         /alpaca
             model.yaml

# Running
cortex run openhermes --preset llama3

# Presets
cortex presets list
cortex presets add <name> <model.yaml_to_save_as_preset>