feat: add zsort formatter

[mstdokumaci]

Adds a formatter definition for zsort, an opinionated @import organizer for Zig. It sorts, groups, and hoists import declarations into four bands (std/builtin, third-party, local, aliases), similar to isort for Python.

The formatter runs zsort fix on a temp file (stdin = false): conform copies the buffer to .conform.$RANDOM.$FILENAME, zsort rewrites it in place, and conform reads the result back.

Installation

zsort must be on $PATH:

brew tap mstdokumaci/zsort
brew install mstdokumaci/zsort/zsort

Prebuilt binaries are also available on the releases page (https://github.com/mstdokumaci/zsort/releases).

Usage

require("conform").setup({
  formatters_by_ft = {
    zig = { "zsort", "zigfmt" },
  },
})

zsort organizes imports; zigfmt handles general formatting. The two don't conflict — zig fmt never reorders imports.