Move PriceCalculationEvent and EstimatedPriceCalculationEvent to shared (#37782)

* moce PriceCalculationEvent to shared

* Update Content.Shared/Cargo/PriceCalculationEvent.cs

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>

---------

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>

Content.Shared/Cargo/PriceCalculationEvent.cs

@@ -0,0 +1,38 @@
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Cargo;
+
+/// <summary>
+/// A directed by-ref event fired on an entity when something needs to know its price. This value is not cached.
+/// </summary>
+[ByRefEvent]
+public record struct PriceCalculationEvent()
+{
+    /// <summary>
+    /// The total price of the entity.
+    /// </summary>
+    public double Price = 0;
+
+    /// <summary>
+    /// Whether this event was already handled.
+    /// </summary>
+    public bool Handled = false;
+}
+
+/// <summary>
+/// Raised broadcast for an entity prototype to determine its estimated price.
+/// </summary>
+/// <param name="Prototype">The prototype to estimate the price for.</param>
+[ByRefEvent]
+public record struct EstimatedPriceCalculationEvent(EntityPrototype Prototype)
+{
+    /// <summary>
+    /// The total price of the entity.
+    /// </summary>
+    public double Price = 0;
+
+    /// <summary>
+    /// Whether this event was already handled.
+    /// </summary>
+    public bool Handled = false;
+}