Separate "thank you" messages from general ads (#25867)

* Separated "thank you" messages from general ads

* Moved MessagePackPrototype to shared, cleaned up AdvertiseComponent, and actually killed AdvertisementsPackPrototype.
+More suggests changes.

* Rename PackPrototypeID to Pack in both components.

Content.Server/Advertise/Components/AdvertiseComponent.cs

@@ -0,0 +1,45 @@
+using Content.Server.Advertise.EntitySystems;
+using Content.Shared.Advertise;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Server.Advertise.Components;
+
+/// <summary>
+/// Makes this entity periodically advertise by speaking a randomly selected
+/// message from a specified MessagePack into local chat.
+/// </summary>
+[RegisterComponent, Access(typeof(AdvertiseSystem))]
+public sealed partial class AdvertiseComponent : Component
+{
+    /// <summary>
+    /// Minimum time in seconds to wait before saying a new ad, in seconds. Has to be larger than or equal to 1.
+    /// </summary>
+    [DataField]
+    public int MinimumWait { get; private set; } = 8 * 60;
+
+    /// <summary>
+    /// Maximum time in seconds to wait before saying a new ad, in seconds. Has to be larger than or equal
+    /// to <see cref="MinimumWait"/>
+    /// </summary>
+    [DataField]
+    public int MaximumWait { get; private set; } = 10 * 60;
+
+    /// <summary>
+    /// The identifier for the advertisements pack prototype.
+    /// </summary>
+    [DataField(required: true)]
+    public ProtoId<MessagePackPrototype> Pack { get; private set; }
+
+    /// <summary>
+    /// The next time an advertisement will be said.
+    /// </summary>
+    [DataField]
+    public TimeSpan NextAdvertisementTime { get; set; } = TimeSpan.Zero;
+
+    /// <summary>
+    /// Whether the entity will say advertisements or not.
+    /// </summary>
+    [DataField]
+    public bool Enabled { get; set; } = true;
+}