feat!: Replace defaultOptions with addOptions (#2088)

* add new addOptions option

* replace defaultOptions with addOptions for all extensions

* replace defaultOptions with addOptions for all demos

* replace defaultOptions with addOptions in docs

* refactoring

* refactoring

* drop object support for addOptions

* fix optional options

* fix tests

demos/src/Experiments/GenericFigure/Vue/figcaption.ts

@@ -3,8 +3,10 @@ import { Node, mergeAttributes } from '@tiptap/core'
 export const Figcaption = Node.create({
   name: 'figcaption',
 
-  defaultOptions: {
-    HTMLAttributes: {},
+  addOptions() {
+    return {
+      HTMLAttributes: {},
+    }
   },
 
   content: 'inline*',

demos/src/Experiments/GenericFigure/Vue/figure.ts

@@ -4,8 +4,10 @@ import { Plugin } from 'prosemirror-state'
 export const Figure = Node.create({
   name: 'figure',
 
-  defaultOptions: {
-    HTMLAttributes: {},
+  addOptions() {
+    return {
+      HTMLAttributes: {},
+    }
   },
 
   group: 'block',