feat(pack): add odin language pack

lua/astrocommunity/pack/odin/README.md

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+# Odin Language Pack
+
+**Requirements:** `odin` should be in your `PATH` to use the language server
+
+This plugin pack does the following:
+
+- Adds `odin` Treesitter parser
+- Adds [`ols`](https://github.com/DanielGavin/ols) language server
+- Adds `odinfmt` formatter (bundled with `ols`) via [`conform.nvim`](https://github.com/stevearc/conform.nvim)

lua/astrocommunity/pack/odin/init.lua

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+return {
+  {
+    "AstroNvim/astrocore",
+    optional = true,
+    ---@type AstroCoreOpts
+    opts = {
+      treesitter = { ensure_installed = { "odin" } },
+    },
+  },
+  {
+    "mason-org/mason-lspconfig.nvim",
+    optional = true,
+    opts = function(_, opts)
+      opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "ols" })
+    end,
+  },
+  {
+    "WhoIsSethDaniel/mason-tool-installer.nvim",
+    optional = true,
+    opts = function(_, opts)
+      -- `ols` ships the `odinfmt` formatter binary alongside the language server
+      opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "ols" })
+    end,
+  },
+  {
+    "stevearc/conform.nvim",
+    optional = true,
+    opts = {
+      formatters_by_ft = {
+        odin = { "odinfmt" },
+      },
+    },
+  },
+}