[material_ui] add enableInlinePrediction parameter to TextFormField

[lsaudon]

Add enableInlinePrediction parameter to TextFormField.

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Code Review

This pull request adds the enableInlinePrediction property to TextFormField and forwards it to the underlying TextField. A corresponding widget test has been added to verify that the property is correctly propagated. There are no review comments, and I have no feedback to provide.

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