Trigger action on backPress button in Toolbar

[carlossteinzup]

Use case

It is necessary to register an action to send analytics info when the backpress button is pressed on a Toolbar.

Proposal

• That it is possible to register a list of actions on the backPress button on the Toolbar or
• That an analytic event could be implemented for the backPress button when a Toolbar is configured.

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[josenetozup]

Another use case is to show a confirmation modal to exit the flow or not.