Add a SpaceExplorerFlowCoordinator. (#4383)

* Add a SpaceExplorerFlowCoordinator.

* Project tweaks

- iOS 17.5 so that we can use the simulator.
- Make a Spaces group for common Space related views.
- Fix the tab bar badge colour on iPhone landscape and iPadOS 17 (18 is still wrong 😒)

project.yml

@@ -11,8 +11,8 @@ options:
   groupSortPosition: bottom
   createIntermediateGroups: true
   deploymentTarget:
-    iOS: '17.6'
-    macOS: '14.6'
+    iOS: '17.5'
+    macOS: '14.5'
   groupOrdering:
   - order:
     - ElementX