LPS-44083 Remove Google Apps logic because we are moving it to a shared plugin

Hey Brian,

In this first pull I have moved all the logic of Google Apps to a shared plugin. Then, I'll create a hook (something like google-mail-hook) that will include GoogleHook.java and it will use the shared plugin.

This way, we can fully get rid of all this logic and move it to a plugin.

The pull where the shared is created is this: https://github.com/brianchandotcom/liferay-plugins/pull/2649

Tomorrow I'll send the second part. 

Thx!

cc/ @migue