fix: Add 'object' to data type

[ryum91]

Please check if the PR fulfills these requirements

• It's the right issue type on the title
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes/features)
• Docs have been added/updated (for bug fixes/features)
• It does not introduce a breaking change or has a description of the breaking change

Description

현재 props 중 'data' 의 형식이 'Array' 만 설정되어 있습니다.
하지만 'data' 의 형식은 DataSource 타입의 Object 도 가능합니다.
따라서 'data' 형식에 'Object' 를 추가합니다.

ps. 관련된 Guide 문서 또한 업데이트가 필요합니다.
　　(README - props, GettingStarted - props)

---

Thank you for your contribution to TOAST UI product. 🎉 😘 ✨

[jung-han]

@ryum91 PR 감사합니다!