Support "-language-version" CLI option for compatibility with older releases

Introduce LanguageFeatureSettings, instance of which should be injected by the
container and be accessible everywhere during the compilation (front-end and
back-end).

Parameters of LanguageFeatureSettings are unused in this commit, will be used
later

compiler/tests-common/org/jetbrains/kotlin/renderer/AbstractDescriptorRendererTest.kt

@@ -20,6 +20,7 @@ import com.intellij.openapi.editor.impl.DocumentImpl
 import com.intellij.openapi.util.io.FileUtil
 import org.jetbrains.kotlin.cli.jvm.compiler.CliLightClassGenerationSupport
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
+import org.jetbrains.kotlin.config.LanguageFeatureSettings
 import org.jetbrains.kotlin.container.ComponentProvider
 import org.jetbrains.kotlin.container.get
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
@@ -60,7 +61,8 @@ abstract class AbstractDescriptorRendererTest : KotlinTestWithEnvironment() {
                 FileBasedDeclarationProviderFactory(context.storageManager, listOf(psiFile)),
                 CliLightClassGenerationSupport.NoScopeRecordCliBindingTrace(),
                 JvmPlatform,
-                targetEnvironment
+                targetEnvironment,
+                LanguageFeatureSettings.LATEST
         )
 
         val resolveSession = container.get<ResolveSession>()

compiler/tests-common/org/jetbrains/kotlin/tests/di/injection.kt

@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.tests.di
 
 import com.intellij.openapi.project.Project
+import org.jetbrains.kotlin.config.LanguageFeatureSettings
 import org.jetbrains.kotlin.container.*
 import org.jetbrains.kotlin.context.ModuleContext
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
@@ -33,6 +34,7 @@ fun createContainerForTests(project: Project, module: ModuleDescriptor): Contain
     return ContainerForTests(createContainer("Tests") {
         configureModule(ModuleContext(module, project), JvmPlatform)
         useInstance(LookupTracker.DO_NOTHING)
+        useInstance(LanguageFeatureSettings.LATEST)
         useImpl<ExpressionTypingServices>()
     })
 }