feat(lang.angular): configure prettier as formatter for angular templates (#4345)

## Description

Angular templates didn't have a configured formatter.
This PR configures prettier as a default formatter for angular
templates.

## Checklist

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

lua/lazyvim/plugins/extras/lang/angular.lua

@@ -57,4 +57,15 @@ return {
       })
     end,
   },
+
+  -- formatting
+  {
+    "conform.nvim",
+    opts = function(_, opts)
+      if LazyVim.has_extra("formatting.prettier") then
+        opts.formatters_by_ft = opts.formatters_by_ft or {}
+        opts.formatters_by_ft.htmlangular = { "prettier" }
+      end
+    end,
+  },
 }