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

to allow interning individual file-path arguments on the IDE

KTIJ-24976

compiler/fir/modularized-tests/tests/org/jetbrains/kotlin/fir/AbstractFrontendModularizedTest.kt

@@ -77,7 +77,7 @@ abstract class AbstractFrontendModularizedTest : AbstractModularizedTest() {
         if (originalArguments != null) {
             configuration.put(JVMConfigurationKeys.NO_JDK, originalArguments.noJdk)
 
-            for (modularRoot in originalArguments.javaModulePath?.split(File.pathSeparatorChar).orEmpty()) {
+            for (modularRoot in originalArguments.javaModulePath.orEmpty()) {
                 configuration.add(CLIConfigurationKeys.CONTENT_ROOTS, JvmModulePathRoot(modularRoot.fixPath()))
             }