Endpoint for APIv4: GET /team/{team_id}/channels (#5681)

i18n/en.json

@@ -4707,6 +4707,10 @@
     "id": "store.sql_channel.get_more_channels.get.app_error",
     "translation": "We couldn't get the channels"
   },
+  {
+    "id": "store.sql_channel.get_public_channels.get.app_error",
+    "translation": "We couldn't get public channels"
+  },
   {
     "id": "store.sql_channel.increment_mention_count.app_error",
     "translation": "We couldn't increment the mention count"