Refactor NotificationConfigurations.list() to use iterator pattern

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Description

Refactored Notification Configuration resource to implement the iterator pattern for listing operations.

Changes Include

• Updated NotificationConfigurations.list() to return Iterator[NotificationConfiguration]
• Replaced list-style response handling with generator-based iteration
• Implemented lazy evaluation using the shared _Service._list() helper for automatic pagination
• Updated unit tests to properly consume the iterator and validate API calls
• Maintained backward compatibility for existing model structures

In Examples

• Verified iterator-based usage in examples/notification_configuration.py
• Demonstrated listing of notification configurations using iterator pattern
• Validated create → read → update → verify → delete workflow

Testing

All unit tests passing.

• Full test suite: 396 passed
• Notification configuration tests: 31 passed

Notification Configuration Tests

Notification Configuration API Example for organization: prab-sandbox01

Example execution: