Add support for quick room search through the Cmd+K shortcut (#2363)

ElementX/Sources/Application/Windowing/WindowManagerProtocol.swift

@@ -32,6 +32,8 @@ protocol WindowManagerProtocol: AnyObject, OrientationManagerProtocol {
     var mainWindow: UIWindow! { get }
     /// Presented on top of the main window, to display e.g. user indicators.
     var overlayWindow: UIWindow! { get }
+    /// A window layered on top of the main one. Used by the global search function
+    var globalSearchWindow: UIWindow! { get }
     /// A secondary window that can be presented instead of the main/overlay window combo.
     var alternateWindow: UIWindow! { get }
     
@@ -46,4 +48,9 @@ protocol WindowManagerProtocol: AnyObject, OrientationManagerProtocol {
     
     /// Shows the alternate window, hiding the main and overlay combo.
     func switchToAlternate()
+    
+    /// Makes the global search window key. Used to get automatic text field focus.
+    func showGlobalSearch()
+    
+    func hideGlobalSearch()
 }