docs: init Realtime authz docs (#22803)

* chore: init Realtime authz docs

* fix: some Vale fixes

* fix: run Prettier

* fix: Prettier

* fix: add note to contact us with placeholder link

* fix: swap rules for policies

* fix: lots of changes

* fix: update for latest Authz model

* fix: nits

* fix: more nits

* fix: nit

* edits

* fix: remove realtime.channel names and fix `in` filters

* fix: caps

* fix: moar

* fix: change h3 to h4

* fix: clarify interaction with postgres_changes

* fix: added simple steps to enable

* Update apps/docs/content/guides/realtime/authorization.mdx

Co-authored-by: Charis <26616127+charislam@users.noreply.github.com>

* Update apps/docs/content/guides/realtime/authorization.mdx

Co-authored-by: Wen Bo Xie <5532241+w3b6x9@users.noreply.github.com>

* Update apps/docs/content/guides/realtime/authorization.mdx

Co-authored-by: Wen Bo Xie <5532241+w3b6x9@users.noreply.github.com>

* Update apps/docs/content/guides/realtime/authorization.mdx

Co-authored-by: Wen Bo Xie <5532241+w3b6x9@users.noreply.github.com>

* fix: add clarity to how it works

* fix: `features` to `extensions`

* fix: clarity

* fix: spelling

* fix: add detail about the test query.

* updates

* updates

* updates

* fix: update schema

* fix: prettier

* fix: rewrite section

* fix: create tables sql

* fix: shorten policy names

---------

Co-authored-by: Charis <26616127+charislam@users.noreply.github.com>
Co-authored-by: Wen Bo Xie <5532241+w3b6x9@users.noreply.github.com>
Co-authored-by: Wen Bo Xie <wenbo.xie3@gmail.com>

apps/docs/components/Navigation/NavigationMenu/NavigationMenu.constants.ts

@@ -1296,6 +1296,11 @@ export const realtime: NavMenuConstant = {
         },
       ],
     },
+    {
+      name: 'Security',
+      url: undefined,
+      items: [{ name: 'Authorization', url: '/guides/realtime/authorization' }],
+    },
     {
       name: 'Guides',
       url: undefined,