Fullscreen MediaViewer refactor

- Moved media related logic into notedeck instead of the ui crate,
  since they pertain to Images/ImageCache based systems

- Made RenderableMedia owned to make it less of a nightmware
  to work with and the perf should be negligible

- Added a ImageMetadata cache to Images. This is referenced
  whenever we encounter an image so we don't have to
  redo the work all of the time

- Relpaced our ad-hoc, hand(vibe?)-coded panning and zoom logic
  with the Scene widget, which is explicitly designed for
  this use case

- Extracted and detangle fullscreen media rendering from inside of note
  rendering.  We instead let the application decide what action they
  want to perform when note media is clicked on.

- We add an on_view_media action to MediaAction for the application to
  handle. The Columns app uses this toggle a FullscreenMedia app
  option bits whenever we get a MediaAction::ViewMedis(urls).

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_columns/src/ui/timeline.rs

@@ -3,7 +3,7 @@ use egui::{vec2, Direction, Layout, Pos2, Stroke};
 use egui_tabs::TabColor;
 use nostrdb::Transaction;
 use notedeck::ui::is_narrow;
-use notedeck_ui::jobs::JobsCache;
+use notedeck::JobsCache;
 use std::f32::consts::PI;
 use tracing::{error, warn};