[CLI] K2JVMCompilerArguments: Model classpath as Array<String>

to allow interning individual file-path arguments on the IDE

KTIJ-24976

jps/jps-common/test/CompilerArgumentsSerializationTest.kt

@@ -34,7 +34,7 @@ class CompilerArgumentsSerializationTest {
     @Test
     fun testLongClasspathArgumentJVM() {
         doSerializeDeserializeAndCompareTest<K2JVMCompilerArguments> {
-            classpath = generateSequence { generateRandomString(50) }.take(10).toList().joinToString(File.pathSeparator)
+            classpath = generateSequence { generateRandomString(50) }.take(10).toList().toTypedArray()
         }
     }