Support bun in Node package manager detection

[williamhuang910520]

Code of Conduct

• I agree to follow this project's Code of Conduct

What would you like to see changed?

Currently, the Node segment's PackageManagerName only detects npm, yarn, and pnpm when fetch_package_manager is enabled.
https://ohmyposh.dev/docs/segments/languages/node#properties-1

It would be a great improvement to also detect bun, a new and increasingly popular JavaScript runtime and package manager.

Specifically:

• I noticed that oh-my-posh already supports bun as a CLI tool under the CLI segment.
• Similarly, it would be helpful to add bun support in the Node segment by detecting the existence of bun.lockb (the lockfile used by bun projects).
• Based on this detection, set .PackageManagerName to bun, and if possible, associate a .PackageManagerIcon just like npm, yarn, and pnpm.

This would ensure better compatibility with projects adopting bun and offer a more complete developer experience for users moving beyond traditional Node.js package managers.