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/Screens/RoomMembers/View/RoomMemberDetailsMemberCell.swift

@@ -27,19 +27,12 @@ struct RoomMemberDetailsMemberCell: View {
             context.send(viewAction: .selectMember(id: member.id))
         } label: {
             HStack {
-                if let avatar = member.avatar {
-                    Image(uiImage: avatar)
-                        .resizable()
-                        .scaledToFill()
-                        .frame(width: avatarSize, height: avatarSize)
-                        .clipShape(Circle())
-                        .accessibilityHidden(true)
-                } else {
-                    PlaceholderAvatarImage(text: member.name ?? "", contentId: member.id)
-                        .clipShape(Circle())
-                        .frame(width: avatarSize, height: avatarSize)
-                        .accessibilityHidden(true)
-                }
+                LoadableAvatarImage(url: member.avatarURL,
+                                    name: member.name ?? "",
+                                    contentID: member.id,
+                                    avatarSize: .user(on: .roomDetails),
+                                    imageProvider: context.imageProvider)
+                    .accessibilityHidden(true)
 
                 Text(member.name ?? "")
                     .font(.element.callout.bold())
@@ -49,9 +42,6 @@ struct RoomMemberDetailsMemberCell: View {
                 Spacer()
             }
             .accessibilityElement(children: .combine)
-            .task {
-                context.send(viewAction: .loadMemberData(id: member.id))
-            }
         }
     }
 }