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/HomeScreen/View/HomeScreenInvitesButton.swift

@@ -17,8 +17,6 @@
 import SwiftUI
 
 struct HomeScreenInvitesButton: View {
-    @ScaledMetric private var badgeSize = 12.0
-    
     let title: String
     let hasBadge: Bool
     let action: () -> Void
@@ -44,7 +42,7 @@ struct HomeScreenInvitesButton: View {
     
     private var badge: some View {
         Circle()
-            .frame(width: badgeSize, height: badgeSize)
+            .scaledFrame(size: 12)
             .foregroundColor(.compound.iconAccentTertiary)
     }
 }