Enable removal of PaywallEventsObserver callback#191
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In the integration example (https://adapty.io/docs/flutter-quickstart-paywalls#full-example) a
StatefulWidgetis registered as a paywall event observer withAdaptyUI().setPaywallsEventsObserver(this);, creating a reference to object.However, no method to clear such registration is given, forcing the library to keep the
Widgetalive (via ref count).This PR modifies the
setPaywallsEventObserverby enabling the callback to be null, thus enabling cleanup actions.