Add method to retrieve page ID without retrieving the whole content in Remote APIs

There are a variety of methods which take a page-id, but the only way to get a page-id if you have the space/name is to call getPage. however, this call will retrieve the content as well, which may be large an not necessary. would be nice to have some form of getPageNoContent just for getting the metadata (also could be used to see if the version number has changed, etc). or maybe a getPageSummary method (although that's a very trimmed down structure, would work for getting page-id but not current version)