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

packages/extension-placeholder/src/placeholder.ts

@@ -1,7 +1,7 @@
 import { Editor, Extension } from '@tiptap/core'
 import { Node as ProsemirrorNode } from 'prosemirror-model'
-import { Decoration, DecorationSet } from 'prosemirror-view'
 import { Plugin } from 'prosemirror-state'
+import { Decoration, DecorationSet } from 'prosemirror-view'
 
 export interface PlaceholderOptions {
   emptyEditorClass: string,