[2.x] Add MultiSelect table filter

[dllobell]

This pull request adds a MultiSelect based table filter. It simply renders the MultiSelect form component and it uses the whereIn method from the Builder to filter the results.

I had to make two little modifications to the MultiSelect form component:

1. I added the flex-wrap class to the list of select options since it breaks when too many are selected
   
   

2. I added the stop modifier to the button click event when deselecting an option, without it for some reason it hides the filter dialog on click.

If this pull request is accepted I would happily add the corresponding docs. 👍

[danharrin]

Hey! This looks good. This morning I added relationship support to the normal select filter. Could you do the same here? Check out this PR for guidance #762.

[dllobell]

Sure!, I just added relationship support, I believe there is no whereInRelation method or something like that in the Builder class so I used the whereHas method directly. Let me know if something is missing.

[danharrin]

This is great, thank you!