seperate Stealth and StealthOnMove (#12035)

Content.Shared/Stealth/Components/StealthOnMoveComponent.cs

@@ -0,0 +1,22 @@
+namespace Content.Shared.Stealth.Components
+{
+    /// <summary>
+    ///     When added to an entity with stealth component, this component will change the visibility
+    ///     based on the entity's (lack of) movement.
+    /// </summary>
+    [RegisterComponent]
+    public sealed class StealthOnMoveComponent : Component
+    {
+        /// <summary>
+        /// Rate that effects how fast an entity's visibility passively changes.
+        /// </summary>
+        [DataField("passiveVisibilityRate")]
+        public readonly float PassiveVisibilityRate = -0.15f;
+
+        /// <summary>
+        /// Rate for movement induced visibility changes. Scales with distance moved.
+        /// </summary>
+        [DataField("movementVisibilityRate")]
+        public readonly float MovementVisibilityRate = 0.2f;
+    }
+}