feat(lang): add Typst language support (#4042)

## Description

This pull request introduces robust support for the
[Typst](https://github.com/typst/typst) language in LazyVim, enhancing
the Typst editing experience with several integrated tools:

1. **LSP Support**: Integrate with
[tinymist](https://github.com/Myriad-Dreamin/tinymist) provides
comprehensive LSP support.
2. **Code Formatting**: Integrate with
[typstyle](https://github.com/Enter-tainer/typstyle) for code
formatting.
3. **Preview Support**: Added
[typst-preview.nvim](https://github.com/chomosuke/typst-preview.nvim)
for live preview of Typst documents.

## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

---------

Co-authored-by: Jose Storopoli <jose@storopoli.io>
Co-authored-by: Stefan Boca <45266795+stefanboca@users.noreply.github.com>
Co-authored-by: Folke Lemaitre <folke.lemaitre@gmail.com>

lua/lazyvim/plugins/extras/lang/typst.lua

@@ -0,0 +1,80 @@
+return {
+  recommended = function()
+    return LazyVim.extras.wants({
+      ft = { "typst" },
+    })
+  end,
+
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = {
+      ensure_installed = { "typst" },
+    },
+  },
+
+  {
+    "neovim/nvim-lspconfig",
+    opts = {
+      servers = {
+        tinymist = {
+          keys = {
+            {
+              "<leader>cP",
+              function()
+                local buf_name = vim.api.nvim_buf_get_name(0)
+                local file_name = vim.fn.fnamemodify(buf_name, ":t")
+                LazyVim.lsp.execute({
+                  command = "tinymist.pinMain",
+                  arguments = { buf_name },
+                })
+                LazyVim.info("Tinymist: Pinned " .. file_name)
+              end,
+              desc = "Pin main file",
+            },
+          },
+          single_file_support = true, -- Fixes LSP attachment in non-Git directories
+          settings = {
+            formatterMode = "typstyle",
+          },
+        },
+      },
+    },
+  },
+
+  {
+    "stevearc/conform.nvim",
+    optional = true,
+    opts = {
+      formatters_by_ft = {
+        typst = { "typstyle", lsp_format = "prefer" },
+      },
+    },
+  },
+
+  {
+    "chomosuke/typst-preview.nvim",
+    cmd = { "TypstPreview", "TypstPreviewToggle", "TypstPreviewUpdate" },
+    keys = {
+      {
+        "<leader>cp",
+        ft = "typst",
+        "<cmd>TypstPreviewToggle<cr>",
+        desc = "Toggle Typst Preview",
+      },
+    },
+    opts = {
+      dependencies_bin = {
+        tinymist = "tinymist",
+      },
+    },
+  },
+
+  {
+    "folke/ts-comments.nvim",
+    opts = {
+      lang = {
+        typst = { "// %s", "/* %s */" },
+      },
+    },
+  },
+}