ECS AsteroidRock and add a doafter to mining (#6120)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/RandomAppearance/RandomAppearanceComponent.cs

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+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Log;
+using Robust.Shared.Reflection;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.RandomAppearance;
+
+[RegisterComponent, ComponentProtoName("RandomAppearance")]
+[Friend(typeof(RandomAppearanceSystem))]
+public class RandomAppearanceComponent : Component, ISerializationHooks
+{
+    [DataField("spriteStates")]
+    public string[] SpriteStates = {"0", "1", "2", "3", "4"};
+
+    /// <summary>
+    ///     What appearance enum key should be set to the random sprite state?
+    /// </summary>
+    [DataField("key", required: true)]
+    public string EnumKeyRaw = default!;
+
+    /// <summary>
+    ///     The actual enum after reflection.
+    /// </summary>
+    public System.Enum? EnumKey;
+
+    void ISerializationHooks.AfterDeserialization()
+    {
+        if (IoCManager.Resolve<IReflectionManager>().TryParseEnumReference(EnumKeyRaw, out var @enum))
+        {
+            EnumKey = @enum;
+        }
+        else
+        {
+            Logger.Error($"RandomAppearance enum key {EnumKeyRaw} could not be parsed!");
+        }
+    }
+}

Content.Server/RandomAppearance/RandomAppearanceSystem.cs

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+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Log;
+using Robust.Shared.Random;
+using Robust.Shared.Reflection;
+
+namespace Content.Server.RandomAppearance;
+
+public class RandomAppearanceSystem : EntitySystem
+{
+    [Dependency] private readonly IRobustRandom _random = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<RandomAppearanceComponent, ComponentInit>(OnComponentInit);
+    }
+
+    private void OnComponentInit(EntityUid uid, RandomAppearanceComponent component, ComponentInit args)
+    {
+        if (TryComp(uid, out AppearanceComponent? appearance) && component.EnumKey != null)
+        {
+            appearance.SetData(component.EnumKey, _random.Pick(component.SpriteStates));
+        }
+    }
+}