Ladybird: Implement a JavaScript console for the AppKit chrome

This adds menu items to open an interactive JavaScript console for a web
page. This more or less mimics the Qt implementation of the console.
Hooks are included to tie the lifetime of the console window with the
tab it belongs to; if the tab is closed, the console window is closed.

Ladybird/AppKit/UI/Tab.mm

@@ -12,6 +12,8 @@
 #include <LibGfx/ShareableBitmap.h>
 
 #import <Application/ApplicationDelegate.h>
+#import <UI/Console.h>
+#import <UI/ConsoleController.h>
 #import <UI/LadybirdWebView.h>
 #import <UI/Tab.h>
 #import <UI/TabController.h>
@@ -29,6 +31,8 @@ static constexpr CGFloat const WINDOW_HEIGHT = 800;
 @property (nonatomic, strong) NSString* title;
 @property (nonatomic, strong) NSImage* favicon;
 
+@property (nonatomic, strong) ConsoleController* console_controller;
+
 @end
 
 @implementation Tab
@@ -95,6 +99,31 @@ static constexpr CGFloat const WINDOW_HEIGHT = 800;
     return self;
 }
 
+#pragma mark - Public methods
+
+- (void)tabWillClose
+{
+    if (self.console_controller != nil) {
+        [self.console_controller.window close];
+    }
+}
+
+- (void)openConsole:(id)sender
+{
+    if (self.console_controller != nil) {
+        [self.console_controller.window makeKeyAndOrderFront:sender];
+        return;
+    }
+
+    self.console_controller = [[ConsoleController alloc] init:self];
+    [self.console_controller showWindow:nil];
+}
+
+- (void)onConsoleClosed
+{
+    self.console_controller = nil;
+}
+
 #pragma mark - Private methods
 
 - (TabController*)tabController
@@ -185,6 +214,11 @@ static constexpr CGFloat const WINDOW_HEIGHT = 800;
     self.title = Ladybird::string_to_ns_string(url.serialize());
     self.favicon = [Tab defaultFavicon];
     [self updateTabTitleAndFavicon];
+
+    if (self.console_controller != nil) {
+        auto* console = (Console*)[self.console_controller window];
+        [console reset];
+    }
 }
 
 - (void)onTitleChange:(DeprecatedString const&)title