Allow notification to be shown more than once

[TomBeckett]

Closes https://github.com/stimulus-components/stimulus-notification/issues/4.

Usage example:

<div data-controller="your-controller-name" data-your-controller-name-repeat-value="true"></div>

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[guillaumebriday]

moved to https://github.com/stimulus-components/stimulus-components/issues/108