Introduce KClass-based cache for KPackageFragment

* It is a heavy-weight object that is hard to compute
* It is being constructed each type _cached_ method ref is used in equals/hashCode
* Module name is deliberately ignored, corresponding doc is added where appropriate 

#KT-48136

Merge-request: KT-MR-6817
Merged-by: Vsevolod Tolstopyatov <qwwdfsad@gmail.com>

libraries/stdlib/jvm/runtime/kotlin/jvm/internal/Reflection.java

@@ -52,6 +52,7 @@ public class Reflection {
     }
 
     public static KDeclarationContainer getOrCreateKotlinPackage(Class javaClass, String moduleName) {
+        // This signature cannot be removed as it is used in FunctionReferenceLowering.kt non-directly
         return factory.getOrCreateKotlinPackage(javaClass, moduleName);
     }