feat: Implement single-word question format

[apomalyn]

As a user, I want to have questions where I'm asked to translate or spell a word

Requirements

Implement the SingleWordQuestion model extending TextQuestion. It should be implemented using freezed

Implement a single-word question where the following instructions are supported:

• spell_romaji: using a simple text input
• spell_kana: if possible use the Japanese keyboard otherwise use options
• translate_to_app_language: using a simple text input
• translate_to_japanese: if possible use the Japanese keyboard otherwise use options

Design

Question flow


Dependencies

Child of #160

Depends on:

• 169

• 180

• 189

Parent of:

• 182

• 183

• 184

• 195