smoke grenades (#20996)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/Explosion/Components/OnTrigger/SmokeOnTriggerComponent.cs

@@ -0,0 +1,41 @@
+using Content.Server.Explosion.EntitySystems;
+using Content.Shared.Chemistry.Components;
+using Robust.Shared.Prototypes;
+
+namespace Content.Server.Explosion.Components;
+
+/// <summary>
+/// Creates a smoke cloud when triggered, with an optional solution to include in it.
+/// No sound is played incase a grenade is stealthy, use <see cref="SoundOnTriggerComponent"/> if you want a sound.
+/// </summary>
+[RegisterComponent, Access(typeof(SmokeOnTriggerSystem))]
+public sealed partial class SmokeOnTriggerComponent : Component
+{
+    /// <summary>
+    /// How long the smoke stays for, after it has spread.
+    /// </summary>
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public float Duration = 10;
+
+    /// <summary>
+    /// How much the smoke will spread.
+    /// </summary>
+    [DataField(required: true), ViewVariables(VVAccess.ReadWrite)]
+    public int SpreadAmount;
+
+    /// <summary>
+    /// Smoke entity to spawn.
+    /// Defaults to smoke but you can use foam if you want.
+    /// </summary>
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public ProtoId<EntityPrototype> SmokePrototype = "Smoke";
+
+    /// <summary>
+    /// Solution to add to each smoke cloud.
+    /// </summary>
+    /// <remarks>
+    /// When using repeating trigger this essentially gets multiplied so dont do anything crazy like omnizine or lexorin.
+    /// </remarks>
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public Solution Solution = new();
+}