Implement Additional Finance Features in Finance Assistant

[Kritika75]

issue fix #513

This pull request adds several new features to the Finance Assistant application, enhancing functionality and user experience. These additions improve tracking, reporting, and budget management.

Features Implemented

1. Expense Summary and Monthly Reports: Generates reports comparing expenses to budgets for better financial tracking.
2. Recurring Expenses Management: Allows users to log and manage recurring expenses, such as subscriptions.
3. Alerts for Budget Limits: Notifies users when they approach or exceed their set budgets.
4. Data Visualization: Adds charts to visualize spending by category.
5. Currency Conversion: Enables multi-currency conversion for global users.
6. CSV Data Export: Adds the option to export expense summaries as CSV files.
7. Detailed Expense History: Allows users to view detailed expense histories by category.

Output

1. Expense Summary Reports: A structured overview of monthly expenses against budgets.
2. Recurring Expenses Management: Notifications for upcoming subscriptions due for payment.
3. Budget Alerts: Real-time alerts when the user’s expenses exceed the budget limit.
4. Data Visualization: Graphical representation (e.g., bar charts, pie charts) showing spending trends by category.
5. Currency Conversion: Ability to display expenses in multiple currencies with real-time conversion rates.
6. CSV Export: A downloadable CSV file containing a summary of expenses, formatted with relevant columns (Date, Category, Amount).
7. Detailed History View: A comprehensive list of past expenses categorized for easy reference.

@suryanshsk