feat(feature:autopay): biller and bills setup

[biplab1]

Jira Task: 293

Screenshots

bills-billers.mp4

Description

• Implemented screens to add billers (name, account number, contact, category) and bills (amount, due date, recurrence)
• Added validation for required fields, amount checks, date picker for due dates, and preview of upcoming payments
• Enabled saving billers and bills to local storage with navigation back to dashboard after creation
• Added lists for bills and billers to view saved entries
• Developed data layer with biller and bill models, repositories, API integration, local storage handling, and error validation
• Used dummy data wherever backend API integration is pending clarification

• Apply the AndroidStyle.xml style template to your code in Android Studio.

• Run the unit tests with ./gradlew check to make sure you didn't break anything

• If you have multiple commits please combine them into one commit by squashing them.

[biplab1]

Please merge it after #1909