[WIP] Call destroy to do cleanup work when pattern element is removed.#1013

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thet wants to merge 3 commits intomasterfrom

Commits on May 30, 2022

feat(core utils): Add unique_id to utils for generating random, unique id.
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feat(core events): Add remove_condition callback to add_event_listener to allow automatic removal of theevent registration if the callback evaluates to true.
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feat(core registry): Automatically call destroy method on a pattern instance if the pattern element is removed.
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