feat: add bun installation support

[keeakita]

Allow devenv to manage bun versions. We plan to use this in getsentry/firetower

Test Plan

Installed locally with tox, ran devenv sync in a properly configured firetower repo (PR for this coming soon)

[sentry]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: devenv/lib/archive.py

Function	Unhandled Issue
download	RuntimeError: checksum mismatch for https://github.com/oven-sh/bun/releases/download/bun-v1.2.21/bun-darwin-aarch64.zip: ... Event Count: 2
download	RuntimeError: checksum mismatch for https://github.com/astral-sh/uv/releases/download/0.8.2/uv-aarch64-apple-darwin.tar.gz: ... Event Count: 1
download	KeyboardInterrupt sync in main Event Count: 1

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