[material_ui] add enableInlinePrediction parameter to TextFormField

[lsaudon]

Add enableInlinePrediction parameter to TextFormField.

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[gemini-code-assist]

Code Review

This pull request adds the enableInlinePrediction parameter to the TextFormField constructor and forwards it to the underlying TextField widget. A corresponding widget test has been added to verify this behavior. There are no review comments, and I have no feedback to provide.