feat: add stylelint v17 support (#377)

* feat: add stylelint v17 support

Use dynamic import() to load stylelint, enabling support for ESM-only
stylelint v17 while maintaining backward compatibility with v13-v16.

- Switch from require() to dynamic import() for loading stylelint
- Update formatter loading to handle promise-based formatters (v16+)
- Add module: node16 to tsconfig for dynamic import support
- Bump minimum Node.js version to 20.19.0 (required by stylelint v17)
- Update tests to use stylelintPath option for mocking

Closes #376

BREAKING CHANGE: Minimum Node.js version is now 20.19.0

* fix: remove skipLibCheck

* fix: upgrade stylelint version

* fix: npm audit

* refactor: coverage and dead code

* ci: add stylelint 17.x

---------

Co-authored-by: Ricardo Gobbo de Souza <ricardogobbosouza@yahoo.com.br>

Author: zalishchuk

.cspell.json

@@ -16,7 +16,8 @@
     "notcss",
     "stylelintcache",
     "eslintcache",
-    "autocrlf"
+    "autocrlf",
+    "nodenext"
   ],
 
   "ignorePaths": [

.github/workflows/nodejs.yml

@@ -62,8 +62,11 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         node-version: [18.x, 20.x, 22.x, 24.x]
-        stylelint-version: [13.x, 14.x, 15.x, 16.x]
+        stylelint-version: [13.x, 14.x, 15.x, 16.x, 17.x]
         webpack-version: [latest]
+        exclude:
+          - node-version: 18.x
+            stylelint-version: 17.x
 
     runs-on: ${{ matrix.os }}