Fix UTFDataFormatException on encoding long subplugin options.

ObjectOutputStream.writeUTF(String) has an unsigned short limit on
String length. On Projects with deep nested modules subplugin
options could produce String over this limit.

^KT-45202 Fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/subpluginUtils.kt

@@ -23,6 +23,7 @@ import org.jetbrains.kotlin.gradle.tasks.CompilerPluginOptions
 import java.io.ByteArrayOutputStream
 import java.io.File
 import java.io.ObjectOutputStream
+import java.nio.charset.StandardCharsets
 import java.util.*
 
 fun encodePluginOptions(options: Map<String, List<String>>): String {
@@ -35,7 +36,9 @@ fun encodePluginOptions(options: Map<String, List<String>>): String {
 
         oos.writeInt(values.size)
         for (value in values) {
-            oos.writeUTF(value)
+            val valueBytes = value.toByteArray(StandardCharsets.UTF_8)
+            oos.writeInt(valueBytes.size)
+            oos.write(valueBytes)
         }
     }