APIv4 post /channels/ids (#5845)

* APIv4 post /channels/ids

* updated enpoint as /teams/{team_id}/channels/ids

i18n/en.json

@@ -4707,6 +4707,14 @@
     "id": "store.sql_channel.get_channels.not_found.app_error",
     "translation": "No channels were found"
   },
+  {
+    "id": "store.sql_channel.get_channels_by_ids.get.app_error",
+    "translation": "We couldn't get the channels"
+  },
+  {
+    "id": "store.sql_channel.get_channels_by_ids.not_found.app_error",
+    "translation": "No channel found"
+  },
   {
     "id": "store.sql_channel.get_deleted_by_name.existing.app_error",
     "translation": "We couldn't find the existing deleted channel"