feat: support custom markdown parsers (#835)

* feat: support custom markdown parsers

* fix: markdown test

* feat: add markdown quote parser

* chore: use markdown parser

* chore: parse unordered list, to_do list and quote

* feat: add a markdown editor example

* feat: add bulleted list parser

* feat: support nested list and img

* feat: support code block

* feat: support table parser

* chore: refacotr code

* fix: flutter analyze

* chore: add more tests and remove unused files

* fix: test

example/pubspec.yaml

@@ -31,7 +31,7 @@ dependencies:
     sdk: flutter
 
   appflowy_editor:
-    path: ../
+
   provider: ^6.0.3
   url_launcher: ^6.1.5
   path_provider: ^2.0.15
@@ -43,6 +43,12 @@ dependencies:
   highlight: ^0.7.0
   http: ^1.1.0
   show_fps: ^1.0.6
+  appflowy_editor_plugins: ^0.0.6
+  markdown:
+
+dependency_overrides:
+  appflowy_editor:
+    path: ../
 
 dev_dependencies:
   flutter_test: