Dynamically instantiating TabContent component causes duplication

[Kasopej]

First of all, thanks for adapting this package for Vue 3!

The issue is that using a v-if on a TabContent component within a FormWizard causes the tab content to be created multiple times.
i.e if the condition toggles between true & false (multiple times), the content is duplicated. Even if you add a key attribute to label the component

Example
<form-wizard> <tab-content v-if="includeTab" key="some-tab" title="Some Tab" icon="lnr lnr-apartment" /> </form-wizard>

If includeTab changes from false to true, and false to true again, the 'some-tab' TabContent is rendered multiple times even though there's only one instance passed to the default slot

Update

This is caused by injected addTab method being called by TabContent.. there is no check for uniqueness. I have opened a PR for this