Add sprite movement states (#22940)

* Add sprite movement states

Did it for borgs for reference for future implementations.

* Fix

* Fix prediction issue

* review

Content.Client/Movement/Systems/SpriteMovementSystem.cs

@@ -0,0 +1,51 @@
+using Content.Shared.Movement.Components;
+using Content.Shared.Movement.Events;
+using Content.Shared.Movement.Systems;
+using Robust.Client.GameObjects;
+using Robust.Shared.Timing;
+
+namespace Content.Client.Movement.Systems;
+
+/// <summary>
+/// Handles setting sprite states based on whether an entity has movement input.
+/// </summary>
+public sealed class SpriteMovementSystem : EntitySystem
+{
+    [Dependency] private readonly IGameTiming _timing = default!;
+
+    private EntityQuery<SpriteComponent> _spriteQuery;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<SpriteMovementComponent, MoveInputEvent>(OnSpriteMoveInput);
+        _spriteQuery = GetEntityQuery<SpriteComponent>();
+    }
+
+    private void OnSpriteMoveInput(EntityUid uid, SpriteMovementComponent component, ref MoveInputEvent args)
+    {
+        if (!_timing.IsFirstTimePredicted)
+            return;
+
+        var oldMoving = SharedMoverController.GetNormalizedMovement(args.OldMovement) != MoveButtons.None;
+        var moving = SharedMoverController.GetNormalizedMovement(args.Component.HeldMoveButtons) != MoveButtons.None;
+
+        if (oldMoving == moving || !_spriteQuery.TryGetComponent(uid, out var sprite))
+            return;
+
+        if (moving)
+        {
+            foreach (var (layer, state) in component.MovementLayers)
+            {
+                sprite.LayerSetData(layer, state);
+            }
+        }
+        else
+        {
+            foreach (var (layer, state) in component.NoMovementLayers)
+            {
+                sprite.LayerSetData(layer, state);
+            }
+        }
+    }
+}