add precommit hook for linting and automatic eslint fixes + update eslint packages (#2862)

* chore: add precommit hook for eslint fixes, fix linting issues
* chore: add eslint import sort plugin

demos/preview/Shiki.vue

@@ -4,11 +4,12 @@
 </template>
 
 <script>
-import Worker from './shiki.worker?worker'
 // this import is a bugfix
 // otherwise the `onig.wasm` file is missing in the dist folder
 import 'shiki/dist/onig.wasm?url'
 
+import Worker from './shiki.worker?worker'
+
 export default {
   props: {
     code: {