Machine upgrading framework [NO CONTENT YET] (#11528)

* upgrading parts baseline

* don't hardcode prototypes

* 0xsomethingsomething review i sorry i forgot your name

Content.Shared/Construction/Prototypes/MachinePartPrototype.cs

@@ -0,0 +1,22 @@
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Construction.Prototypes;
+
+/// <summary>
+/// This is a prototype for categorizing
+/// different types of machine parts.
+/// </summary>
+[Prototype("machinePart")]
+public sealed class MachinePartPrototype : IPrototype
+{
+    /// <inheritdoc/>
+    [IdDataField]
+    public string ID { get; } = default!;
+
+    /// <summary>
+    /// A stock part entity based on the machine part.
+    /// </summary>
+    [DataField("stockPartPrototype", customTypeSerializer: typeof(PrototypeIdSerializer<EntityPrototype>))]
+    public string? StockPartPrototype { get; }
+}