Add the initial implementation for managing spaces. (#4963)

This isn't hooked up into the flows yet.

ElementX/Sources/Services/Spaces/SpaceServiceProxy.swift

@@ -76,6 +76,15 @@ class SpaceServiceProxy: SpaceServiceProxyProtocol {
         }
     }
     
+    func removeChild(_ childID: String, from spaceID: String) async -> Result<Void, SpaceServiceProxyError> {
+        do {
+            return try await .success(spaceService.removeChildFromSpace(childId: childID, spaceId: spaceID))
+        } catch {
+            MXLog.error("Failed to remove child \(childID) to space \(spaceID)")
+            return .failure(.sdkError(error))
+        }
+    }
+    
     // MARK: - Private
     
     private func handleUpdates(_ updates: [SpaceListUpdate]) {

ElementX/Sources/Services/Spaces/SpaceServiceProxyProtocol.swift

@@ -26,4 +26,5 @@ protocol SpaceServiceProxyProtocol {
     
     /// Adds a room (or space) as a child of another space.
     func addChild(_ childID: String, to spaceID: String) async -> Result<Void, SpaceServiceProxyError>
+    func removeChild(_ childID: String, from spaceID: String) async -> Result<Void, SpaceServiceProxyError>
 }