feat(pack): add Moonbit language support

lua/astrocommunity/pack/moonbit/README.md

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+# Moonbit Language Pack
+
+Requires:
+
+- [Moonbit CLI tools](https://www.moonbitlang.com/download/#moonbit-cli-tools)
+- [moonbit-lsp](https://www.npmjs.com/package/@moonbit/moonbit-lsp)
+
+This plugin pack does the following:
+
+- Adds [`moonbit.nvim`](https://github.com/tonyfettes/moonbit.nvim) plugin which adds
+  - Adds `moonbit` Treesitter parser
+  - Adds `moonbit-lsp` language server

lua/astrocommunity/pack/moonbit/init.lua

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+return {
+  {
+    "tonyfettes/moonbit.nvim",
+    ft = "moonbit",
+    -- uncomment when mason support added to make sure command is available
+    -- dependencies = {
+    --   { "williamboman/mason.nvim", optional = true },
+    -- },
+    opts = function(_, opts)
+      -- only enable treesitter if the plugin is available
+      if not require("astrocore").is_available "nvim-treesitter" then opts.treesitter = { enabled = false } end
+      -- only enable the LSP if the lsp command is executable
+      if vim.fn.executable "moonbit-lsp" == 1 then
+        local astrolsp_avail, astrolsp = pcall(require, "astrolsp")
+        if astrolsp_avail then opts.lsp = astrolsp.lsp_opts "moonbit" end
+      else
+        opts.lsp = false
+      end
+    end,
+  },
+  -- uncomment if/when moonbit-lsp is added to lspconfig and mason-lspconfig
+  -- {
+  --   "williamboman/mason-lspconfig.nvim",
+  --   opts = function(_, opts)
+  --     opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "harper-ls" })
+  --   end,
+  -- },
+  -- uncomment when merged upstream: https://github.com/mason-org/mason-registry/pull/7350
+  -- {
+  --   "WhoIsSethDaniel/mason-tool-installer.nvim",
+  --   optional = true,
+  --   opts = function(_, opts)
+  --     opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "moonbit-lsp" })
+  --   end,
+  -- },
+}