Add fragment cache to GobiertoBudgets module

[ferblape]

API

There's action cache in almost all actions. Add this cache to the pending actions.

Budgets home

Create a fragment cache (using as parameters the year and the locale) the whole home page, excluding the navigation menu and the footer. The controller should check the presence of the fragment to avoid doing requests to the ES and the database.

Cache expiration

All ETLs expire the cache of the site after importing data. We should probably expire it too when the options of budgets module change.

[ferblape]

In #3110 @entantoencuanto added page cache