[WIP] Add extension option for custom imports in package loading

[Copilot]

Plan to implement custom import configuration feature:

• Add configuration setting for custom package imports in package.json
• Update sidebar.ts to use custom import configuration when loading packages
• Update getImportName function or create new logic to handle custom imports
• Add UI to allow users to configure custom imports
• Test the feature with various import patterns
• Update documentation (README.md) to explain the new feature

Current behavior: When checking a package box, it imports the whole package using import <package>
Target behavior: Allow users to define custom import patterns like from package import module or import package as alias

Original prompt

Work on TODO: A default option is to load the whole package, but we can write an extension option to allow users define custom imports (from src/sidebar.ts)

Created from VS Code via the GitHub Pull Request extension.

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