Add hyperlink creation feature

[choidabom]

What this PR does / why we need it?

This PR introduces a feature that enhances text selection by enabling the automatic creation of hyperlinks when dragging and selecting text prior to pasting a link. Currently, users experience the inconvenience of having URLs pasted directly into the text instead of being applied as hyperlinks to the selected text.

With this enhancement, the system will automatically detect if the copied content is a link and generate a Markdown link format that connects the selected text with the URL, thus improving the overall user experience.

Any background context you want to provide?

Streamlining the hyperlink creation process will not only save time for users but also ensure that linking text is more intuitive. This is particularly useful for users who frequently need to reference external sources, as they can now create clickable links with a simple drag-and-select action, enhancing productivity and usability.

What are the relevant tickets?

Fixes https://github.com/yorkie-team/codepair/issues/322

Checklist

• [x] Added relevant tests or not required
• [x] Didn't break anything

Summary by CodeRabbit

• New Features

  • Introduced a new toolbar management system for improved formatting options in the editor.
  • Added functionality for seamless hyperlink insertion from the clipboard, enhancing user experience.

• Bug Fixes

  • Streamlined the toolbar's visibility and selected formats, improving responsiveness to user interactions.

• Chores

  • Removed unused imports to enhance code clarity and maintainability.
  • Updated dependencies for enhanced type support and validation functionalities.

[coderabbitai[bot]]

Walkthrough

The changes involve the introduction of a new useToolBar hook for managing the state of a formatting toolbar in a text editor, refactoring the Editor component to utilize this hook. Additionally, a new utility for hyperlink insertion has been created, allowing users to easily link selected text to URLs. These modifications enhance the overall functionality and structure of the codebase.

Changes

Files	Change Summary
frontend/src/components/editor/Editor.tsx	Refactored to use useToolBar for toolbar state management; removed unused imports.
frontend/src/hooks/useToolBar.ts	Introduced a new hook for managing toolbar visibility and selected formats.
frontend/src/hooks/useFormatUtils.ts	Added checkAndAddFormat function to conditionally modify format sets based on text selection.
frontend/src/utils/urlHyperlinkInserter.ts	Added functionality for inserting hyperlinks into the editor based on pasted URLs.
frontend/package.json	Added dependencies for validator and @types/validator to support hyperlink functionality.

Assessment against linked issues

Objective	Addressed	Explanation
Add hyperlink creation feature (#322)	✅

🐰 Hopping through the code so bright,
A toolbar that dances, oh what a sight!
Links now can flourish with just a quick paste,
Formatting made easy, no time to waste!
In the editor's garden, we play and we cheer,
With each little change, the magic draws near! 🌟

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