Add IModFileInfo#showAsDataPack (#18)

* Add separate flag for showing mod as data pack in addition to showing as resource pack

Co-Authored-By: Luke Bemish <lukebemish@lukebemish.dev>

Author: PaintNinja

src/main/java/net/minecraftforge/forgespi/language/IModFileInfo.java

@@ -19,6 +19,13 @@ record LanguageSpec(String languageName, VersionRange acceptedVersions) {}
 
     boolean showAsResourcePack();
 
+    /**
+     * @return true if this mod file should be shown as a data pack.
+     */
+    default boolean showAsDataPack() {
+        return false;
+    }
+  
     /**
      * Indicates if this mod file is only intended for physical clients.
      * <p>When true, the loader will skip loading this mod file on dedicated servers.</p>