Redactor 2 removed a lot of functionality and delegated to plugins, including the functionality you're after. It made Redactor more lightweight but more of a hassle to get functionality back in, especially when using Craft CMS, where a plugin is required.
This plugin should provide you with the image position functionality:
https://github.com/picdorsey/craft-redactorimageposition
I have not yet seen a plugin for the image size functionality, although it should be straightforward to create. Good luck!!