Capability to mention users in a document (#4838)

* feat: mention user

* fix: trigger api call on every letter typed

* fix: this allows command menu to re-render upon props change, shouldComponentUpdate prevented re-rendering when necessary

* fix: add node

* fix: mention node styling

* fix: Caret not visible after inserting mention

* fix: apply mentionRule

* fix: label is to be obtained from content, not attrs

* feat: add mentions table and model

* fix: typo

* fix: make all mention nodes visible in shared doc

* feat: parse mention ids from doc text

* feat: MentionsProcessor

* feat: documents.publish tests

* feat: tests for MentionsProcessor

* feat: schedule notifs for mentions

* fix: get rid of Mention model

* fix: put actor id and mention id in raw md

* Revert "fix: put actor id and mention id in raw md"

This reverts commit 3bb8a22e3c560971dccad6d2f82266256bcb2d96.

* Revert "Revert "fix: put actor id and mention id in raw md""

This reverts commit 3c5b36c40cebf147663908cf27d0dce6488adfad.

* fix: review

* fix: no need of set

* fix: show avatar

* fix: get rid of eventName

* fix: font-weight

* fix: prioritize mention notifs

* fix: store id in md

* fix: no need of prepending m

* fix: fetchPage

* fix: Avatars incorrect color

* fix: remove scanRE

* fix: test

* fix: include alphabet other than latin

* lockfile

* fix: regex should test for letters, marks and digits

---------

Co-authored-by: Tom Moor <tom.moor@gmail.com>

shared/i18n/locales/en_US/translation.json

@@ -232,6 +232,7 @@
   "Are you sure you want to make {{ userName }} a member?": "Are you sure you want to make {{ userName }} a member?",
   "Are you sure you want to make {{ userName }} an admin? Admins can modify team and billing information.": "Are you sure you want to make {{ userName }} an admin? Admins can modify team and billing information.",
   "Are you sure you want to suspend {{ userName }}? Suspended users will be prevented from logging in.": "Are you sure you want to suspend {{ userName }}? Suspended users will be prevented from logging in.",
+  "Profile picture": "Profile picture",
   "Insert column after": "Insert column after",
   "Insert column before": "Insert column before",
   "Insert row after": "Insert row after",
@@ -808,7 +809,6 @@
   "<em>Note:</em> Signing back in will cause a new account to be automatically reprovisioned.": "<em>Note:</em> Signing back in will cause a new account to be automatically reprovisioned.",
   "Are you sure? Deleting your account will destroy identifying data associated with your user and cannot be undone. You will be immediately logged out of {{appName}} and all your API tokens will be revoked.": "Are you sure? Deleting your account will destroy identifying data associated with your user and cannot be undone. You will be immediately logged out of {{appName}} and all your API tokens will be revoked.",
   "Delete My Account": "Delete My Account",
-  "Profile picture": "Profile picture",
   "You joined": "You joined",
   "Joined": "Joined",
   "{{ time }} ago.": "{{ time }} ago.",