feat(virtual-core): add `startItem` option
🎯 Changes
The goal of this pr is to give the possibility to add a custom left or top for a virtual item. Typical scenario: Having a horizontal timeline where every width can be a place for a start item.
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- [X] I have followed the steps listed in the Contributing guide.
- [X] I have tested and linted this code locally.
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Latest commit: 65a81e4f198bad9448142a5a3f4d67822fc71452
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