[TASK] Add getView and getRequest to event

[sypets]

Add more methods to the event FormControllerFormActionEvent. It is now possible to also retrieve the view and request from this event. This makes it possible to - for example - add variables to the view.

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Adding this so that traw/powermailcaptcha can add a variable to the view directly, instead of having to XCLASS FormController, see https://github.com/in2code-de/powermail_cleaner/issues/1

I hope this might be generally useful as well.