Reflection: create synthetic classes for Java lambdas

... as well as $SwitchMap and other synthetic classes generated by javac
or other JVM language compilers or runtimes.

Note that for Kotlin, all synthetic classes were already handled by the
subsequent check for `KotlinClassHeader.Kind.SYNTHETIC_CLASS`, but after
this change we won't call `ReflectKotlinClass.create` for those, which
is a minor optimization.

 #KT-41373 Fixed

compiler/testData/codegen/box/reflection/syntheticClasses/syntheticClasses.kt

@@ -90,9 +90,7 @@ fun box(): String {
     checkMultifileClass()
     checkMultifileClassPart()
     checkKotlinLambda()
-
-    // TODO: fails with KotlinReflectionInternalError: Unresolved class: class JavaClass$$Lambda$1166/180251002 (kind = null)
-    // checkJavaLambda()
+    checkJavaLambda()
 
     return "OK"
 }