Add lambda configurable languageSettings function in KotlinSourceSet

Function with Groovy Closure is already exists, it provides DSL parity
#KT-44834 Fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/sources/DefaultKotlinSourceSet.kt

@@ -71,6 +71,9 @@ class DefaultKotlinSourceSet(
         ConfigureUtil.configure(configureClosure, this)
     }
 
+    override fun languageSettings(configure: LanguageSettingsBuilder.() -> Unit): LanguageSettingsBuilder =
+            languageSettings.apply { configure(this) }
+
     override fun getName(): String = displayName
 
     override fun dependencies(configure: KotlinDependencyHandler.() -> Unit): Unit =

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/plugin/sources/SourceSetVisibilityInferenceTest.kt

@@ -253,6 +253,7 @@ class MockKotlinSourceSet(private val name: String) : KotlinSourceSet {
     override val resources: SourceDirectorySet get() = throw UnsupportedOperationException()
     override val languageSettings: LanguageSettingsBuilder get() = throw UnsupportedOperationException()
     override fun languageSettings(configureClosure: Closure<Any?>): LanguageSettingsBuilder = languageSettings
+    override fun languageSettings(configure: LanguageSettingsBuilder.() -> Unit): LanguageSettingsBuilder = languageSettings
     override val apiMetadataConfigurationName: String get() = throw UnsupportedOperationException()
     override val implementationMetadataConfigurationName: String get() = throw UnsupportedOperationException()
     override val compileOnlyMetadataConfigurationName: String get() = throw UnsupportedOperationException()