Add Bun as supported package manager

[Juli0q]

Add support for NPM packages installed using Bun.

Requirements

• Detect whether a project is a Bun project
• Detect declared license for a package
• Get dependency tree including package names, versions
• Obtain meta data for a dependency
• Consider the support for Bun workspaces

I am going to implement this for the final exam of my apprenticeship.