Add more info to Fabric's geyser dumps (#4175)

* Added onlineMode, platformName, and Minecraft version to dump - renames platformVersion to loaderVersion since that is more fitting to modded structure

* rename loaderVersion back to platformVersion

* address review by @Konicai

* Fix geyser dump creation (regression from the syntax/annotation PR)

core/src/main/java/org/geysermc/geyser/text/AsteriskSerializer.java

@@ -68,6 +68,11 @@ public class AsteriskSerializer extends StdSerializer<Object> implements Context
     String asterisk;
     boolean isIp;
 
+    @SuppressWarnings("unused") // Used by Jackson for Geyser dumps
+    public AsteriskSerializer() {
+        super(Object.class);
+    }
+
     public AsteriskSerializer(String asterisk, boolean isIp) {
         super(Object.class);
         this.asterisk = asterisk;