packageManager supports bun as a package manager

[gxy5202]

🙋 feature request

Hope that PackageManager can support the detection of bundle
https://github.com/parcel-bundler/parcel/blob/v2/packages/core/core/src/PackageManager.js

🤔 Expected Behavior

I hope to use the bun command to install the package after detecting bun
https://bun.com/docs/pm/cli/install

😯 Current Behavior

When parcel automatically detects the packages that need to be installed, it will detect whether the current package manager is npm, yarn, or pnpm. But I am using bun now, so I get an error.

💁 Possible Solution

🔦 Context

💻 Examples