[Feature] Highlight Endpoints

[Katsshura]

Highlight feature - Enabled API

Open API docs:

http://localhost:8080/swagger-ui.html
http://localhost:8080/v3/api-docs

HighlightDTO Schema:

Fields marked with * are required and cannot be null.

Field	Constraints
id	integer($int64)
enabled	boolean
product	ProductDTO
title*	string
subtitle*	string

Request JSON Example - POST - {{url}}/product/highlight/<product_id>

{
    "title": "Testing Title One",
    "subtitle": "Testing Description One"
}

Response JSON Example - GET - {{url}}/product/highlight

{
    "id": 2,
    "enabled": true,
    "product": {
        "id": 1,
        "name": "Test Product One",
        "description": "Product Test Via Postman One",
        "price": 0.99,
        "image_url": "https://images.unsplash.com/photo-1551404973-7dec6ee9bba7?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1287&q=80",
        "available_stock": 5,
        "popularity": 0.0
    },
    "title": "Testing Title One",
    "subtitle": "Testing Description One"
}

PUT Endpoint - {{url}}/product/highlight/<highlight_id>