Use Teleport to position dropdown

[sophieews]

When parent component places restrictions on the overflow/positioning of child components this has an unwanted effect on the 'dropdown' part of the vue-multiselect component. Because we want the dropdown to be at the top of the stack, using Vue 3's new teleport functionality may make sense. The desired z-index of the div the dropdowns get teleported to could be a variable to provide flexibility with other teleported components.

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[mattelen]

Great idea! I'll look into this in the coming weeks and see if we can make this happen