feat(ecs): suspending component DSL

read / readOrNull / modify primitives that take an EntityHandle,
switch to the entity's world dispatcher, run the block on the world
thread, and return to the caller's dispatcher. ComponentRegistry
maps KClass to opaque ComponentType keys for O(1) hot-path lookup.

ecs/build.gradle.kts

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