in vue3 , Drag to allow/ignore elements seems invalid

[luoyu-233]

Software version (please complete the following information):

• Browser [e.g. chrome, safari]
• Vue Version [e.g. 2.5.7]
• vue-grid-layout Version: [e.g. 2.3.3]

Describe the bug A clear and concise description of what the bug is. Vue2's drag allows/ignores elements to be available,But I set drag-ignore-from in vuE3 and it doesn't seem to work,I don't know if VUE3 doesn't support it,I also did not find drag-ignore-from in the source code,I hope you can take a look at this problem in your busy schedule Please use the CodeSandbox Template to demonstrate your bug. It is much easier for us to help you if you do.

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