feat: add model generator

[bxcodec]

TODO:

• Generate from schema for primitive type (feat: First prototype struct generator #7)
• Handle that using $ref in component (feat: resolve using ref in schema #9)
• Generate from non primitive type(feat: support for non primitive data type #10)
• Handle array properly

[ridhoperdana]

What do you mean by handle array properly?
From what I see in this code, it already been handled correctly @bxcodec