Add JavaVersion to MinecraftVersion json

Author: Jonathing

json-data-utils/src/main/java/net/minecraftforge/util/data/json/MinecraftVersion.java

@@ -17,13 +17,20 @@
 public class MinecraftVersion {
     /** The version id. */
     public String id;
+    /** The Java version ({@code null} before 1.17). */
+    public JavaVersion javaVersion;
     /** The artifact downloads. */
     public Map<String, Download> downloads;
     /** The required libraries. */
     public Library[] libraries;
     /** The asset index reference. */
     public AssetsIndexInfo assetIndex;
 
+    public static final class JavaVersion {
+        public String component;
+        public int majorVersion;
+    }
+
     public List<Lib> getLibs() {
         List<Lib> libs = new ArrayList<>();