feat: Allow commenting in code (#5953)

* Allow commenting in code marks

* Allow commenting in code blocks

* Floating comment toolbar in code block

shared/editor/nodes/CodeFence.ts

@@ -150,7 +150,7 @@ export default class CodeFence extends Node {
         },
       },
       content: "text*",
-      marks: "",
+      marks: "comment",
       group: "block",
       code: true,
       defining: true,

shared/editor/nodes/index.ts

@@ -118,4 +118,4 @@ export const richExtensions: Nodes = [
 /**
  * Add commenting and mentions to a set of nodes
  */
-export const withComments = (nodes: Nodes) => [Mention, Comment, ...nodes];
+export const withComments = (nodes: Nodes) => [...nodes, Mention, Comment];