globally search for media (#3528)

* get_chat_media() from any chat similar to search_msgs()

* do not return hidden media

this fixes the issue that drafts
and other hidden messages pop up in the gallery.

* add a test for get_chat_media()

* use None instead of ChatId::new(0)

* clarify scope of 'any' in get_chat_media()

* adapt json rpc to changed get_chat_media()

* jsonrpc: chat_get_media turn chat_id into option
and also still allow `0` for dev convenience
(though I'm not totally sure if thats the right decision)

* cargo fmt

Co-authored-by: Simon Laux <mobile.info@simonlaux.de>

examples/repl/cmdline.rs

@@ -983,11 +983,9 @@ pub async fn cmdline(context: Context, line: &str, chat_id: &mut ChatId) -> Resu
             chat::add_device_msg(&context, None, Some(&mut msg)).await?;
         }
         "listmedia" => {
-            ensure!(sel_chat.is_some(), "No chat selected.");
-
             let images = chat::get_chat_media(
                 &context,
-                sel_chat.as_ref().unwrap().get_id(),
+                sel_chat.map(|c| c.id),
                 Viewtype::Image,
                 Viewtype::Gif,
                 Viewtype::Video,