feat(pack): add kotlin language pack (#366)

lua/astrocommunity/pack/kotlin/README.md

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+
+# Kotlin Language Pack
+
+Requires: 
+- `JDK-17` or higher to function.
+
+This plugin pack does the following:
+
+- Adds `kotlin` treesitter parsers
+- Adds `kotlin_language_server` language server
+- Adds `ktlint` through null-ls
+- Adds `kotlin-debug-adapter` debug adapter for nvim-dap 

lua/astrocommunity/pack/kotlin/init.lua

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+local utils = require "astronvim.utils"
+
+return {
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      if opts.ensure_installed ~= "all" then
+        opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "kotlin")
+      end
+    end,
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    opts = function(_, opts)
+      opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "kotlin_language_server")
+    end,
+  },
+
+  {
+    "jay-babu/mason-null-ls.nvim",
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "ktlint") end,
+  },
+
+  {
+    "jay-babu/mason-nvim-dap.nvim",
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "kotlin") end,
+  },
+}