[TextInputLayout] Set hint style for both floated and default positions

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**Is your feature request related to a problem? Please describe.**
I'm adding text field programmatically and then setting styles to hint with `setHintTextAppearance`, but styles are working only on floated state and I couldn't find the way to apply them to hint at normal state. While `setDefaultHintTextColor`, does work for both. Setting textSize to editText child of TextInputLayout doesn't help also.

**Describe the solution you'd like**
I would like to `setHintTextAppearance` work for both state of hint.

**Describe alternatives you've considered**
It's probably also okay, if there will be new method for this? I don't see any other solutions.

**Additional context**
I would like to help, but I'm not so experienced, so I will need a little bit guidance.

Inizia individuando l'implementazione di TextInputLayout e il codice che gestisce setHintTextAppearance per gli stati di hint flottante e predefinito. Traccia come setDefaultHintTextColor viene applicato a entrambi gli stati, quindi aggiungi un comportamento equivalente e verifica con i test Android pertinenti che lo stile dell'hint sia coerente in ciascuna posizione.

Scritto dal modello di indicizzazione a partire dal testo della issue.