Insert method call

[shiraji]

https://github.com/shiraji/permissions-dispatcher-plugin/blob/master/src/main/kotlin/com/github/shiraji/permissionsdispatcherplugin/handlers/GeneratePMCodeHandler.kt#L75

Now, if onRequestPermissionsResult/onActivityResult method exists, it does not insert XxxPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults);. This plugin should check if developer already write the delegation call, and then if does not exist, insert the line.