[ObjCExport] Add translation of functions and properties extensions

KT-65630

native/objcexport-header-generator/testData/headers/extensionProperties/Foo.kt

@@ -0,0 +1,18 @@
+val topLevelPropA = 0
+val topLevelPropB = 1
+
+val Foo.extensionValA
+    get() = 0
+val Foo.extensionValB
+    get() = 1
+
+var Foo.extensionVarA
+    get() = 0
+    set(value) {}
+var Foo.extensionVarB
+    get() = 1
+    set(value) {}
+
+class Foo {
+    fun memberFun() {}
+}