feat(binding): Hytale SDK glue

The only module that imports com.hypixel.*. Provides World.asExecutor,
EntityHandle adapters for Ref/PlayerRef/Player, scope helpers
(playerScope, worldScope, pluginScope), and installAsync() which wires
PlayerDisconnectEvent to PlayerScopes.cancel.

binding/build.gradle.kts

@@ -0,0 +1,16 @@
+plugins {
+    alias(libs.plugins.kotlin.jvm)
+    `java-library`
+}
+
+dependencies {
+    api(project(":core"))
+    api(project(":ecs"))
+    compileOnly(libs.hytale.server)
+
+    testImplementation(libs.hytale.server)
+    testImplementation(libs.junit.jupiter)
+    testRuntimeOnly(libs.junit.platform.launcher)
+    testImplementation(libs.kotest.assertions)
+    testImplementation(libs.mockk)
+}