Media loading flow changes (#483)

* Use an imageProvider directly from the view in the home screen

* Add support for media request coalescing

* Rename MediaProxy to MediaLoader

* Add new image loading mechanism to the room details screen avatar.

* Use the `SettingsScreen` prefix for all settings screen related components

* Add new image loading mechanism to the room header

* Add new image loading mechanism to the room member details screen

* Introduce a LoadableImage SwiftUI view that will automatically handle image loading

* Adopt the new LoadableImage where possible

* Fix LoadableImage not using/storing loaded images properly

* Simplify media loader enqueueing

* Made LodableImage load content after mediaSource updates. Adopt it on the home and settings screens

* Introduce a LoadableAvatarImage component and reuse it throughout the app

* Small logging tweaks, made some LoadableImage properties private

* Fix redacted skeletons avatar background color

* Fix placeholder avatars changing when backgrounding the app

* PR comments.

- Trim the @ sign off of mxid placeholders.
- Only expose AvatarSize on the avatar image, use CGSize elsewhere.

Co-authored-by: Doug <douglase@element.io>

ElementX/Sources/Application/AppCoordinator.swift

@@ -25,11 +25,7 @@ class AppCoordinator: AppCoordinatorProtocol {
     /// Common background task to resume long-running tasks in the background.
     /// When this task expiring, we'll try to suspend the state machine by `suspend` event.
     private var backgroundTask: BackgroundTaskProtocol?
-    private var isSuspended = false {
-        didSet {
-            MXLog.info("didSet to: \(isSuspended)")
-        }
-    }
+    private var isSuspended = false
     
     private var userSession: UserSessionProtocol! {
         didSet {