add onBeforeActivate and onBeforeDeactivate hook #1518
Description
What problem does this feature solve?
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onActivated and onDeactivated are the only hooks that have no option with the Before prefix.
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I need onBeforeDeactivate to maintain the scroll position when closing or switching between components. In a little more detail I described this in another issue.
What does the proposed API look like?
onBeforeActivate(() => console.log('call #1'));
onActivated(() => console.log('call #2'));
onBeforeDeactivate(() => console.log('call #3'));
onDeactivated(() => console.log('call #4'));