Convert `*.js` files to `*.ts`

[prakashchoudhary07]

Folders/Files to be converted (All files and folders are to be converted, we will track each file based on folders or import order)

• [ ] Constants
• [ ] Utils
• [ ] Middleware
• [ ] Controllers
• [ ] Models
• [ ] Services
• [ ] Tests
• [ ] Others

(Please mention other folders here)

[nitishsaini706]

@prakashchoudhary07 I would like to work on this issue

[prakashchoudhary07]

@sahsisunny