feat: Implement `SingleWordQuestionView`

[apomalyn]

Requirements

Implement the SingleWordQuestionView, it should:

• adapt to display either an input text field or a tap-options system

What needs to be done

• Implement SingleWordQuestionView view under src/practice/questions:
  • constructor takes:
  • SingleWordQuestion question
  • Function(bool askAgain) onAnswered
  • use the TextQuestionViewModel
  • UI use the QuestionSkeleton as a wrapper:
  • implement the design based on the wireframe
    • use Subject widget
  • based on viewModel.useKeyboard display:
    • the list of TextOption
    • an input text field

Design

SingleWordQuestion wireframe: keyboard mode


SingleWordQuestion wireframe: option mode


Dependencies

Child of #181

Depends on:

• 169

• 180

• 182

• 183

• 189