Fix Adjust Plugin Compatibility with Adjust React Native SDK v5

Summary
Adjust released v5 of its [React Native SDK](https://github.com/adjust/react_native_sdk), introducing some breaking changes. The Adjust team has provided a [migration guide](https://dev.adjust.com/en/sdk/migration/react-native/v4-to-v5) detailing these changes.

Currently, these breaking changes cause the analytics-react-native Adjust plugin to fail, as reported in [issue #1036](#1036).

This PR updates the Adjust plugin to be compatible with Adjust React Native SDK v5 while ensuring continued functionality.

Changes

• Refactored the Adjust integration to align with Adjust v5 API changes.
• Updated method calls, event handling, and initialization flow to match the new SDK requirements.
• Ensured backward compatibility where feasible.
• Added necessary adjustments to maintain proper tracking and attribution behavior.

Testing

• Verified that the plugin correctly initializes and communicates with Adjust.
• Ensured events are tracked as expected.
• Checked for regressions in existing functionality.

Notes
This update is necessary for users who want to upgrade to Adjust SDK v5 while continuing to use analytics-react-native.

Fixes #1036.