[material_ui] Update M3E data tokens to version 38.0.1

[elliette]

Work towards flutter/flutter#187899

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[gemini-code-assist]

Code Review

This pull request updates the generated Material Design token defaults from version 36.0.6 to 38.0.1. The changes restructure token classes across various component data files to introduce theme-specific variants, such as dark, light, and contrast-based configurations. Additionally, individual font properties are refactored to use TypescaleStruct definitions, and a new chips.dart file is introduced. I have no feedback to provide.