Feature/add nepali locale

[sabin6969]

Pull Request Checklist

What does this PR do?

Added Nepali locale support to the get_time_ago package.

Checklist

Code Changes

• I have added new features to the package (support for nepali language)

Documentation

• I have updated the README file or relevant documentation with the changes
• I have added code usage examples or updated existing examples to reflect changes
• I have updated the package version in the pubspec.yaml file

Testing

General Tests

• The package correctly formats time differences into human-readable strings
• The package supports dynamic updates (e.g., changing locales, thresholds)

Localization

• The package supports all documented languages
• Custom locales can be added and work as expected
• Language fallback works correctly if a specific locale is missing

Custom Thresholds

• Custom time thresholds are applied correctly
• The package handles edge cases like just now, future dates, or extreme past dates

Error Handling

• The package handles null or invalid inputs gracefully
• Fallback behavior works for unexpected or incorrect configurations

Responsiveness

• The package adapts to time-zone differences accurately
• The formatting responds correctly to locale changes in the app

Performance

• The package performs efficiently, even when processing frequent or large updates
• Performance tests show no regressions

How did you verify your code works?

• I have written unit tests covering the new features
• I ran manual tests to verify time formatting for different locales and thresholds
• I tested with various configurations (custom thresholds, language overrides)
• All tests pass locally (flutter test)
  

Demo.mp4

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