Add support for other platforms

[readefries]

We (Claude and I) updated the renamed dependency (vcse -> @azure/vcse) as I don't like known security issues which was in the old source
and added support for multiple platforms.

This resolves #7

[Copilot]

Pull Request Overview

This PR adds cross-platform support for tracking GitHub Copilot token usage and improves extension robustness by migrating from the deprecated vsce package to @vscode/vsce and enhancing logging capabilities.

• Cross-platform path resolution for Windows, macOS, and Linux/Unix systems
• Enhanced logging system with dedicated output channel
• Improved extension initialization with smart delays for GitHub Codespaces
• Better error handling and debugging capabilities

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/extension.ts	Major refactoring to add cross-platform support, logging system, and improved Copilot extension detection
package.json	Updated dependency from deprecated vsce to @vscode/vsce

[rajbos]

Awesome @readefries ! I added some more logging options to be able to test on different platforms on what folders it tries to use or when it cannot find them.