feat(nix-darwin): Install and configure programming languages bundle

Install programming language toolchains currently installed via Homebrew:

Languages:
- `go` + `goimports` + `golangci-lint`
- `node` (multiple versions: 18, 22, latest)
- `python` (multiple versions: 3.9, 3.10, 3.12, 3.13)
- `ruby` + `ruby-build`
- `dart`

These are currently in:
- `/usr/local/Cellar/`

Note: Rust toolchain is already being managed via rustup in nix.