Feature: Fusion solution for rendering flashmessages in backend module

[ru3fu5z]

Description

Like the Fluid f.flashmessage viewhelper it would be nice to have something similar in Fusion.

Steps to Reproduce

1. Follow the tutorial Creating a backend module with Fusion and Fusion.Form
2. Try to add neos-notifications as easy as in Fluid

Expected behavior

There would be something like Neos.Fusion:Flashmessages

Actual behavior

I have to build the flashmessages from the scratch or i have to insert a Fluid template with the f:flashmessages Viewhelper

[mhsdesign]

one could build a fusion prototype which uses $this->getRuntime()->getControllerContext() and find the flashmessages service and return the items as an array to be used in Neos.Fusion:Loop