[dhanushdotcodes]

Description

• Add all possible routes for slice, slice types, services and test them using postman
• Update db schema and add routes and handlers for memo
• Use HTTPStatus Enum for consistency all over the code and use zod for input schema validation

What type of PR is this? (Check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📄 Documentation Update
• 👨‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🛠️ CI/CD

Screenshots (if applicable)

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes