[lsp] stop application after the main thread finishes

IntelliJ internals can run many their own threads, so to make the app exit, we kill them

Those problems should be investigated, but for now it fixes the hanging application

LSP-166

GitOrigin-RevId: d77781f20114dabaead546b7a1fc68beff3a5804

Author: darthorimar

kotlin-lsp/src/com/jetbrains/ls/kotlinLsp/KotlinLspServer.kt

@@ -32,9 +32,11 @@ import org.jetbrains.kotlin.idea.compiler.configuration.KotlinPluginLayoutModePr
 import org.jetbrains.kotlin.idea.compiler.configuration.isRunningFromSources
 import kotlin.io.path.absolutePathString
 import kotlin.io.path.createTempDirectory
+import kotlin.system.exitProcess
 
 fun main(args: Array<String>) {
     RunKotlinLspCommand().main(args)
+    exitProcess(0)
 }
 
 private class RunKotlinLspCommand : CliktCommand(name = "kotlin-lsp") {