Migrate grapesjs-addon

[gorbunkov]

https://github.com/cuba-platform/grapesjs-addon

• [x] Invesigate the issue
• [x] Create modules
• [x] Move dependencies
• [x] Migrate components:
  • [x] GjsBlock
  • [x] GjsBlocksRepository and GjsBlocksRepositoryImpl
  • [x] GjsPlugin
  • [x] GrapesJsHtmlEditorComponent
  • [x] GrapesJsHtmlEditor and WebGrapesJsHtmlEditor
  • [x] GrapesJsNewsletterHtmlEditor and WebGrapesJsNewsletterHtmlEditor
  • [x] XSD schema
• [x] Migrate plugins (classes and JS scripts):
  • [x] BasicBlocksGjsPlugin
  • [x] CKEditorGjsPlugin
  • [x] CustomCodeGjsPlugin
  • [x] FlexBlocksGjsPlugin
  • [x] FormsGjsPlugin
  • [x] NewsletterGjsPlugin
  • [x] PostCssGjsPlugin
  • [x] StyleFilterGjsPlugin
  • [x] TabsGjsPlugin
  • [x] TooltipGjsPlugin
  • [x] TuiImageEditorGjsPlugin
  • [x] WebpageGjsPlugin
  • [x] GjsPluginsRepository and GjsPluginsRepositoryImpl
• [x] Component loaders:
  • [x] GrapesJsHtmlEditorLoader
  • [x] GrapesJsNewsletterHtmlEditorLoader
  • [x] GrapesJsWebpageHtmlEditorLoader
• [x] CSS styles
• [x] CKEditor
• [x] README.md