Add eclipse build plugin

build.gradle.kts

@@ -3,6 +3,7 @@ import org.gradle.api.tasks.testing.logging.TestLogEvent
 
 plugins {
     java
+    eclipse
     `maven-publish`
     id("com.github.johnrengelman.shadow") version "8.1.1" apply false
     id("io.papermc.paperweight.patcher") version "1.5.5"