Add more metrics (#1896)

- Add the Java version being used
- Add the Minecraft server version being used, alongside the platform type that is using that version. Not used for proxies as those have to be on latest to support the latest Minecraft version

bootstrap/sponge/src/main/java/org/geysermc/platform/sponge/GeyserSpongePlugin.java

@@ -163,4 +163,9 @@ public class GeyserSpongePlugin implements GeyserBootstrap {
     public BootstrapDumpInfo getDumpInfo() {
         return new GeyserSpongeDumpInfo();
     }
+
+    @Override
+    public String getMinecraftServerVersion() {
+        return Sponge.getPlatform().getMinecraftVersion().getName();
+    }
 }