feat(scroll.ts): add custom scroll bar generator

[Dun-sin]

Fixes Issue

My PR closes #553

👨‍💻 Changes proposed(What did you do ?)

• added libraries for testing
• create scroll.ts for custom scroll logic

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title and description of the PR is clear and explains the approach.

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Name	Status	Preview	Comments	Updated (UTC)
code-magic	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 2, 2024 1:31pm