Model import command

[nguyenhoangthuan99]

Implement a command to help user import local gguf file to cortex.cpp
Epic #1154

CLI Setup

The import subcommand is added to the models command with the following options:

• --model_id: A required option to specify the unique identifier for the imported model
• --model_path: A required option to specify the absolute path to the GGUF model file

Usage

To import a model, users can now use the following command:

./your_cli_app models import --model_id <unique_model_id> --model_path /path/to/your/model.gguf