feat(rust): enable dioxus formatter for rust files

lua/plugins/21-format.lua

@@ -0,0 +1,12 @@
+---@type LazySpec
+return {
+    "stevearc/conform.nvim",
+    optional = true,
+    ---@module "conform"
+    ---@type conform.setupOpts
+    opts = {
+        formatters_by_ft = {
+            rust = { "dioxus", lsp_format = "first" },
+        },
+    },
+}