Add scaledFrame/scaledPadding APIs (#2079)

* Add scaled frame and padding modifiers

* Refactor AppLockScreen

* Refactor FormattingToolbar

* Refactor RoomAttachmentPicker

* Refactor ComposerToolbar

* Refactor VoiceMessageRecordingButton

* More refactors

* Refine ScaledPaddingModifier

* Cleanup

* Fix preview tests

* Fix preview test

* Use CompoundIcon for custom image

* Add .scaledFrame(size:) overload

* Set fallback style to .body

ElementX/Sources/Screens/InvitesScreen/View/InvitesScreenCell.swift

@@ -23,8 +23,6 @@ struct InvitesScreenCell: View {
     let acceptAction: () -> Void
     let declineAction: () -> Void
     
-    @ScaledMetric private var badgeSize = 12.0
-    
     var body: some View {
         HStack(alignment: .top, spacing: 16) {
             LoadableAvatarImage(url: invite.roomDetails.avatarURL,
@@ -150,7 +148,7 @@ struct InvitesScreenCell: View {
     
     private var badge: some View {
         Circle()
-            .frame(width: badgeSize, height: badgeSize)
+            .scaledFrame(size: 12)
             .foregroundColor(.compound.iconAccentTertiary)
     }
 }