Drop the need for `v-if="opened"` to render `lume-tooltip` properly

[joao-m-santos]

Feature description

The lume-tooltip component should only mount/render if opened prop is true. Right now, it always renders, and depends on an external v-if from the parent component.

Problem/motivation

Currently, in order for the tooltip to render correctly, you need to add a v-if condition in <lume-tooltip> so that it displays properly and doesn't fly from the top-left corner on hover.

Describe alternatives you've considered

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Additional context

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Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guidelines.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.