Implements Bun as a new language option for pre-commit hooks, enabling
hooks to run using the Bun JavaScript runtime and package manager.
- Add bun.py language implementation with binary download/install
- Support system-installed Bun or automatic version download
- Add comprehensive tests including version handling and hook execution
- Register bun in all_languages.py
- Include test repository fixture for integration tests
This patch adds 2nd class support for hooks using julia as the language.
pre-commit will install any dependencies defined in the hooks repo
`Project.toml` file, with support for `additional_dependencies` as well.
Julia doesn't (yet) have a way to install binaries/scripts so for julia
hooks the `entry` value is a (relative) path to a julia script within
the hooks repository. When executing a julia hook the (globally
installed) julia interpreter is prepended to the entry.
Example `.pre-commit-hooks.yaml`:
```yaml
- id: foo
name: ...
language: julia
entry: bin/foo.jl --arg1
```
Example hooks repo: https://github.com/fredrikekre/runic-pre-commit/tree/fe/julia
Accompanying pre-commit.com PR: https://github.com/pre-commit/pre-commit.com/pull/998Fixes#2689.
