feat(pack): add odin language pack

Author: kuroski

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
+  - Formatting is handled by `odinfmt`, which is bundled with `ols`

lua/astrocommunity/pack/odin/init.lua

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+return {
+  {
+    "AstroNvim/astrocore",
+    optional = true,
+    ---@type AstroCoreOpts
+    opts = {
+      treesitter = { ensure_installed = { "odin" } },
+    },
+  },
+  {
+    "WhoIsSethDaniel/mason-tool-installer.nvim",
+    optional = true,
+    opts = function(_, opts)
+      opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "ols" })
+    end,
+  },
+  {
+    "mason-org/mason-lspconfig.nvim",
+    optional = true,
+    opts = function(_, opts)
+      opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "ols" })
+    end,
+  },
+}