libvulkan: refactor CreateInfoWrapper::SanitizeApiVersion

1. Do not override app apiVersion when icd is higher than 1.0
2. Move extension related codes into SanitizeExtensions

Bug: 160276146
Test: hardcode 1.0, don't dispatch 1.1 core cmds and run vkjson
Change-Id: I10e5a6ea45a3c7dabbe12af04185a59f808f89c9