Use automatic virtual column on some models

[skyrowl]

Hey,
I was primarly thinking of adding auto virtual columns on cart and order models but could extend to all models using a meta column, it's pretty much the same as using '->meta->column' but instead you can use directly '->column'.
There is an open source package from stancle that adds a trait that does it pretty well: https://github.com/archtechx/virtualcolumn
This could improve devs willing to extend those models with few efforts, it can even implement the use of those virtual columns in SQL queries.