feat: add ktlint (nvim-lua#137)

Author: shurizzle

lua/conform/formatters/ktlint.lua

@@ -0,0 +1,9 @@
+---@type conform.FileFormatterConfig
+return {
+  meta = {
+    url = "https://ktlint.github.io/",
+    description = "An anti-bikeshedding Kotlin linter with built-in formatter.",
+  },
+  command = "ktlint",
+  args = { "--format", "--stdin", "--log-level=none" },
+}