feat(ui): SearchResultList treeItem component

[SoonIter]

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	🚀 This PR description was created by Ellipsis for commit 58b5f62.

Summary:

This PR introduces a new UI component for displaying search results in a tree structure, adds the ability to open a file at a specific location from the search results, and includes various updates and new components to support these features.

Key points:

• Introduced SearchResultList component for displaying search results in a tree structure.
• Added 'openFile' functionality to open a file at a specific location from the search results.
• Refactored groupBy function in extension.ts for better readability.
• Added new types in types.ts to support the new features.
• Updated view.ts to handle 'openFile' messages.
• Added new components CodeBlock, FileLink, and TreeItem under SearchResultList/comps.
• Implemented SearchResultList in SearchResultList/index.tsx.
• Updated SearchWidgetContainer for better UI.
• Added useDark hook to handle theme changes.
• Updated SearchSidebar and postMessage to use new components and handle new messages.

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[ellipsis-dev]

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