Route After Invalidation Config

[devotox]

No description provided.

[BobrImperator]

It'd also be nice to have an acceptance test in the test-app that makes sure the configuration is used correctly.

[BobrImperator]

Interesting addition, I like it, it's more descriptive than rootURL but they have the same function.
However I'm not a fan of resolving what route we should redirect to later in the service and I think it should be handled here in the configuration.

rootURL isn't used for anything else and routeAfterInvalidation is basically and alias for it.

I'd suggest something like this, where we either take routeAfterInvalidation value from the configuration or rootURL.

Suggested change

	this.routeAfterInvalidation =
	config.routeAfterInvalidation !== undefined
	? config.routeAfterInvalidation
	: DEFAULTS.routeAfterInvalidation;
	this.routeAfterInvalidation =
	config.routeAfterInvalidation !== undefined
	? config.routeAfterInvalidation
	: this.rootURL;

This would also need to be explained in the doc accordingly.