Initial implementation of AccountSettings. (#6275)

* Make the UserPreference macro also generate an accessor for the key name.

* Initial implementation of AccountSettings.

- Add an AccountUserDefaults storage with a userID prefix on the key.
- Migrate the 2 values reset by AppSettings.resetSessionSpecificSettings to AccountSettings.

* Rename UserSettings.volatile() to UserSettings.mock()

Given it now has a userID parameter with a default value..

Components/BuildExtensions/Tests/MacrosTests/UserPreferenceMacroTests.swift

@@ -5,7 +5,7 @@
 // Please see LICENSE files in the repository root for full details.
 //
 
-import MacrosImplementation
+@testable import MacrosImplementation
 import SwiftSyntaxMacrosTestSupport
 import XCTest
 
@@ -35,6 +35,10 @@ final class UserPreferenceMacroTests: XCTestCase {
                                  _hasSeenNewSoundBannerSubject.prepend(hasSeenNewSoundBanner).eraseToAnyPublisher()
                              }
                              
+                             var hasSeenNewSoundBannerKey: UserPreferenceKey {
+                                 .init("hasSeenNewSoundBanner")
+                             }
+                             
                              func resetHasSeenNewSoundBanner() {
                                  store.removeObject(forKey: "hasSeenNewSoundBanner")
                              }
@@ -65,6 +69,10 @@ final class UserPreferenceMacroTests: XCTestCase {
                                  _liveLocationSharingSessionsByRoomIDSubject.prepend(liveLocationSharingSessionsByRoomID).eraseToAnyPublisher()
                              }
                              
+                             var liveLocationSharingSessionsByRoomIDKey: UserPreferenceKey {
+                                 .init("liveLocationSharingTimeoutDatesByRoomID")
+                             }
+                             
                              func resetLiveLocationSharingSessionsByRoomID() {
                                  store.removeObject(forKey: "liveLocationSharingTimeoutDatesByRoomID")
                              }
@@ -95,6 +103,10 @@ final class UserPreferenceMacroTests: XCTestCase {
                                  _pusherProfileTagSubject.prepend(pusherProfileTag).eraseToAnyPublisher()
                              }
                              
+                             var pusherProfileTagKey: UserPreferenceKey {
+                                 .init("pusherProfileTag")
+                             }
+                             
                              func resetPusherProfileTag() {
                                  store.removeObject(forKey: "pusherProfileTag")
                              }
@@ -125,6 +137,10 @@ final class UserPreferenceMacroTests: XCTestCase {
                                  _viewSourceEnabledSubject.prepend(viewSourceEnabled).eraseToAnyPublisher()
                              }
                              
+                             var viewSourceEnabledKey: UserPreferenceKey {
+                                 .init("viewSourceEnabled")
+                             }
+                             
                              func resetViewSourceEnabled() {
                                  store.removeObject(forKey: "viewSourceEnabled")
                              }