salutejs/types improvements

[sasha-tlt]

• AssistantCommand doesnt implement 'system' and 'navigation' commands.
• SystemMessagePayload doesnt contain sdk_meta field.
• AppState['item_selector']['items']'s server_action and action fields must be typed.
• EmotionId doesnt support full emotions (e.g talk and idle)
• app_info is optional field, e.g Увы, любой навык иногда даёт сбой. Скоро всё исправят, и я снова к вам
• CharacterId contains athena, but athena's id is eva