Amplify Android API Relational Models (#6020)

* feat(api): iOS Android API GraphQL relational models pages

* update schema

* Add callout, update many-to-many schema

* update callout to point to migration guide for existing developers

* add new sections for query and css

* Updates to Android API Relationship page

* Defragmented pages and reordered content.

* Remove iOS docs for now

* Remove iOS docs for now

* Remove fragments

* Add delete code snippet

* Correct description of query

---------

Co-authored-by: Michael Law <1365977+lawmicha@users.noreply.github.com>
Co-authored-by: Rene Brandel <renbran@amazon.com>

Author: 3 people

cspell.json

@@ -1522,7 +1522,8 @@
     "cloudwatchlogs",
     "userids",
     "xmark",
-    "refreshable"
+    "refreshable",
+    "generatemodelsforlazyloadandcustomselectionset"
   ],
   "flagWords": ["hte", "full-stack", "Full-stack", "Full-Stack", "sudo"],
   "patterns": [

src/directory/directory.mjs

@@ -317,6 +317,11 @@ export const directory = {
             route: '/lib/graphqlapi/subscribe-data',
             filters: ['android', 'flutter', 'ios', 'js', 'react-native']
           },
+          {
+            title: 'Relational models',
+            route: '/lib/graphqlapi/relational',
+            filters: ['android']
+          },
           {
             title: 'Working with files and attachments',
             route: '/lib/graphqlapi/working-with-files',