Currently, `TextStyle.lerp()` does not properly interpolate the shadows property between two TextStyle instances. This PR addresses the issue by using ui.Shadow.lerpList() to interpolate the shadow lists, ensuring that the individual shadow properties (blur radius, color, and offset) are correctly lerped.
The changes include:
- Updating the `TextStyle.lerp()` method to use `ui.Shadow.lerpList()` for the shadows property.
- Adding a new test case in `text_style_test.dart` to verify the correct interpolation of text shadows.
Here is a snippet showing the comparison, when using `ui.Shadow.lerpList()`
https://dartpad.dev/?id=799c4bec8b791b74580193174759b93dCloses#145665
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