Add PauseManager functionality; implement pause menu and toggle logic

Scripts/Components/PauseManager.cs

@@ -0,0 +1,29 @@
+using Godot;
+
+namespace ParasiticGod.Scripts.Components;
+
+[GlobalClass]
+public partial class PauseManager : CanvasLayer
+{
+    [Export] private Button _pauseButton;
+    [Export] private Control _pauseMenu;
+
+    public override void _Ready()
+    {
+        ProcessMode = ProcessModeEnum.Always;
+        _pauseMenu.Hide();
+        _pauseButton.Pressed += TogglePause;
+    }
+
+    public override void _Input(InputEvent @event)
+    {
+        if (@event.IsActionPressed("pause")) TogglePause();
+    }
+
+    private void TogglePause()
+    {
+        var isPaused = !GetTree().Paused;
+        GetTree().Paused = isPaused;
+        _pauseMenu.Visible = isPaused;
+    }
+}