Incapsulate subscribe-notify logic for listeners to an Observer-like pattern

[sachyshyn]

https://github.com/emilov2501/use-ui/blob/6aaa21feb2c2d29a1b677514cb025e3dd57e8acc/packages/use-ui/lib/useToast/useToast.ts#L18

You're using this logic in several places, its better to reuse it using class instantiating or factory / hooks

[emilov2501]

@sachyshyn thanks for watching, fixed in patch 1.4.0