Rename KClass.properties and extensionProperties: prepend 'member'

To better emphasize the fact that all returned properties require an instance
of the class they are declared in. Another issue was that
'Some::class.extensionProperties' was sometimes incorrectly perceived as
"get all extension properties available on the class Some"

compiler/testData/codegen/boxWithStdlib/reflection/methodsFromAny/memberExtensionToString.kt

@@ -10,7 +10,7 @@ class A {
 }
 
 fun box(): String {
-    val p = javaClass<A>().kotlin.extensionProperties.single()
+    val p = javaClass<A>().kotlin.memberExtensionProperties.single()
     return if ("$p" == "var A.(kotlin.String.)id") "OK" else "Fail $p"
 
     val q = javaClass<A>().kotlin.declaredFunctions.single()