Simple Text or LongText attributes as custom attributes?

[gitlui]

Hi, I've seen your extension and it looks like it adds some Parts that are definitely missing to the default medusajs.

One thing I am missing in your solution is the possibility to add a plain text attribute, to be able to add things like a simple EAN or such. Is there a reason why this is not included in your plugin? If not, I would be interested to add it or would really be happy if you could add it.