Indicate 1.21.112/1.21.113 support, track server platform types in bstats metrics

bootstrap/bungeecord/src/main/java/org/geysermc/geyser/platform/bungeecord/GeyserBungeePlugin.java

@@ -271,6 +271,11 @@ public class GeyserBungeePlugin extends Plugin implements GeyserBootstrap {
         return Paths.get(getProxy().getName().equals("BungeeCord") ? "proxy.log.0" : "logs/latest.log");
     }
 
+    @Override
+    public @NonNull String getServerPlatform() {
+        return getProxy().getName();
+    }
+
     @Nullable
     @Override
     public SocketAddress getSocketAddress() {

bootstrap/mod/src/main/java/org/geysermc/geyser/platform/mod/GeyserModBootstrap.java

@@ -238,4 +238,9 @@ public abstract class GeyserModBootstrap implements GeyserBootstrap {
             return false;
         }
     }
+
+    @Override
+    public @NonNull String getServerPlatform() {
+        return server.getServerModName();
+    }
 }

bootstrap/spigot/src/main/java/org/geysermc/geyser/platform/spigot/GeyserSpigotPlugin.java

@@ -402,6 +402,11 @@ public class GeyserSpigotPlugin extends JavaPlugin implements GeyserBootstrap {
         return this.minecraftVersion;
     }
 
+    @Override
+    public @NonNull String getServerPlatform() {
+        return Bukkit.getName();
+    }
+
     @Override
     public SocketAddress getSocketAddress() {
         return this.geyserInjector.getServerSocketAddress();

bootstrap/standalone/src/main/java/org/geysermc/geyser/platform/standalone/GeyserStandaloneBootstrap.java

@@ -314,6 +314,11 @@ public class GeyserStandaloneBootstrap implements GeyserBootstrap {
         return new GeyserStandaloneDumpInfo(this);
     }
 
+    @Override
+    public @NonNull String getServerPlatform() {
+        return PlatformType.STANDALONE.platformName();
+    }
+
     @NonNull
     @Override
     public String getServerBindAddress() {

bootstrap/velocity/src/main/java/org/geysermc/geyser/platform/velocity/GeyserVelocityPlugin.java

@@ -230,6 +230,11 @@ public class GeyserVelocityPlugin implements GeyserBootstrap {
         return new GeyserVelocityDumpInfo(proxyServer);
     }
 
+    @Override
+    public @NonNull String getServerPlatform() {
+        return proxyServer.getVersion().getName();
+    }
+
     @Nullable
     @Override
     public SocketAddress getSocketAddress() {

bootstrap/viaproxy/src/main/java/org/geysermc/geyser/platform/viaproxy/GeyserViaProxyPlugin.java

@@ -230,6 +230,11 @@ public class GeyserViaProxyPlugin extends ViaProxyPlugin implements GeyserBootst
         return new GeyserViaProxyDumpInfo();
     }
 
+    @Override
+    public @NonNull String getServerPlatform() {
+        return PlatformType.VIAPROXY.platformName();
+    }
+
     @NonNull
     @Override
     public String getServerBindAddress() {