keyboardOptions
Converts this TextField's own nested keyboardOptions schema into a Compose KeyboardOptions — showKeyboardOnFocus (schema field name; the DSL builder's own parameter for it is howKeyboardOnFocus, a typo in the framework's own keyboardOptions() builder function, not in this schema) maps directly to Compose's own showKeyboardOnFocus.
Return
the resolved KeyboardOptions, or KeyboardOptions.Default when this tile's keyboardOptions is null.