Ability to create share url slug (#4550)

* feat: share url slug

* feat: add col urlId

* feat: allow updating urlId

* fix: typo

* fix: migrations

* fix: urlId model validation

* fix: input label

* fix: debounce slug request

* feat: link preview

* fix: send slug variant in response if available

* fix: temporary redirect to slug variant if available

* fix: move up the custom link field

* fix: process and display backend err

* fix: reset custom link state on popover close and remove isCopied

* fix: document link preview

* fix: set urlId when available

* fix: keep unique(urlId, teamId)

* fix: codeql

* fix: get rid of preview type

* fix: width not needed for block elem

* fix: migrations

* fix: array not required

* fix: use val

* fix: validation on shareId and test

* fix: allow clearing urlId

* fix: do not escape

* fix: unique error text

* fix: keep team

shared/i18n/locales/en_US/translation.json

@@ -475,6 +475,8 @@
   "Backlinks": "Backlinks",
   "Anyone with the link <1></1>can view this document": "Anyone with the link <1></1>can view this document",
   "Share": "Share",
+  "Only lowercase letters, digits and dashes allowed": "Only lowercase letters, digits and dashes allowed",
+  "Sorry, this link has already been used": "Sorry, this link has already been used",
   "Share this document": "Share this document",
   "This document is shared because the parent <em>{{ documentTitle }}</em> is publicly shared": "This document is shared because the parent <em>{{ documentTitle }}</em> is publicly shared",
   "Publish to internet": "Publish to internet",
@@ -484,6 +486,8 @@
   "Share nested documents": "Share nested documents",
   "Nested documents are publicly available": "Nested documents are publicly available",
   "Nested documents are not shared": "Nested documents are not shared",
+  "Custom link": "Custom link",
+  "The document will be available at": "The document will be available at",
   "Automatically redirect to the editor": "Automatically redirect to the editor",
   "Users with edit permission will be redirected to the main app": "Users with edit permission will be redirected to the main app",
   "All users see the same publicly shared view": "All users see the same publicly shared view",