added facetAttributes in Model

[bsormagec]

I try to add quickly facetAttributes option to models to use it for filtering on product or something searching.

[curquiza]

Hello @bsormagec,

Thanks a lot for your PR and your involvement! :)
However, this PR includes a behavior we don't want to handle for the moment.
Indeed, as described in this issue I've just created (you're not the first one who are not aware of this) I explain we want to stay completely compliant with the original laravel/scout usage for the moment.
The way to update settings is described in our wiki here
I'm closing this PR but thank you anyway! It made me create the issue I linked 😊

[bsormagec]

thank you @curquiza i just didn't know another way to do it, that's my fault. Now I see a way to do it another way :)